Publications
Addressing a gap in understanding nuanced variations of asymmetry of information, in this paper we propose a framework to analyse, ideate, design, and discuss asymmetry of information in gaming. We developed a digital cooperative game, exploring some of its dimensions, where players engage with information-based challenge puzzles. Through a user study involving ten pairs of players, we examined how various types of asymmetry of information influenced social interaction and player perspectives. Participants perceived asymmetry, influencing cooperation and progression. Asymmetry drove social interaction, shaping communication patterns and player engagement. Different configurations of asymmetry elicited distinct reactions, highlighting its impact on communication effectiveness and gameplay dynamics. Our study underscores the importance of understanding and leveraging dynamics such as these for crafting engaging and socially enriching gaming experiences.
Daniel Reis, Pedro Pais, David Gonçalves, Kathrin Gerling, André Rodrigues
VIDEOJOGOS 2024 â International Conference on Videogame Sciences and Arts, December, 2024
Competitive games assume stereotypical players with equal abilities face mostly symmetric gameplay. For mixed-ability groups, equal challenges limit the design space and can be unappealing. Conversely, introducing asymmetric play raises concerns about fairness and balance. This work first explores competitive mixed-visual-ability games, focusing on understanding playersâ perspectives of competition, fairness, transparency, and asymmetric play. Our results reveal how disability disclosure can affect the experience, how design choices of asymmetry affect the perceived fairness, that asymmetric competition can be engaging, and the nuances between the perspectives of sighted and blind players.
Pedro Trindade, David Gonçalves, Pedro Pais, João Guerreiro, Tiago Guerreiro, André Rodrigues
VIDEOJOGOS 2024 â International Conference on Videogame Sciences and Arts, December, 2024
In this research, we explore the concept of UI customization for the self and others. We performed a two-week study where nine participants used a custom-designed tool that allows websitesâ UI customization for oneself and to create and reply to customization assistance requests from others. Results suggest that people enjoy customizing for others more than for themselves. They see requests as challenges to solve and are motivated by the positive feeling of helping others. To customize for themselves, people need help with the creative process.
SĂ©rgio Alves, Ricardo Costa, Kyle Montague, Tiago Guerreiro
CSCW 2024 â ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2024
We used an iterative participatory design approach to develop an authoring platform for therapists, enabling them to tailor VR environments during exposure by changing and parameterising elements and reapplying past scenes. We used this platform as a design probe in a study with ten therapists to elicit discussions about the design of VRET experiences and therapistsâ authoring needs
JoĂŁo P. Ferreira, Filipa Ferreira-Brito, JoĂŁo Guerreiro, Tiago Guerreiro
ISMAR 2024 â 23rd IEEE International Symposium on Mixed and Augmented Reality
Working with children with disabilities in Human-Computer Interaction and Human-Robot Interaction presents a unique set of ethical dilemmas. These young participants often require additional care, support, and accommodations, which can fall off researchersâ resources or expertise. The lack of clear guidance on navigating these challenges further aggravates the problem. To provide a basis on which to address this issue, we adopt a critical reflective approach, evaluating our impact by analyzing two case studies involving children with disabilities in HCI/HRI research. Flowing from these, we call for a shift in our approach to ethics in participatory research contexts to one that is processual, situational, and community-led.
Ana Henriques, PatrĂcia Piedade, Filipa Rocha, Isabel Neto, Tiago Guerreiro, Hugo Nicolau
ASSETS 2024 â 26th International ACM SIGACCESS Conference on Computers and Accessibility, October, 2024
We developed a VR application accessible to blind people, based on the arcade game Speed-of-Light, incorporating three diferent techniques to communicate the positions of various buttons on a grid.
Diogo Lança, Manuel Piçarra, InĂȘs Gonçalves, Uran Oh, AndrĂ© Rodrigues, JoĂŁo Guerreiro
ASSETS 2024 â 26th International ACM SIGACCESS Conference on Computers and Accessibility
For families, where abilities, motivations, and availability vary widely, opportunities for intergenerational play are limited. Designing games that cater to these differences remains an open challenge. In this paper, we first identify barriers related with time and expertise. Next, we propose asymmetric game design and asynchronous play to reconcile childrenâs and adultsâ requirements; and interdependent gameplay mechanics to foster real-world interactions. Following this approach, we designed a testbed game and conducted a mixed-methods remote study with six pairs of adult-child family members. Our results showcase how asymmetric, asynchronous experiences can be leveraged to create novel gaming experiences that meet the requirements of family play. We discuss how interdependent progress can be designed to promote real-world interactions, creating pervasive conversational topics that permeate the family routine.
Pedro Pais, David Gonçalves, Kathrin Gerling, Teresa Romão, Tiago Guerreiro, André Rodrigues
CSCW 2024 â ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2024
Phishing has become a pervasive threat to our society. Current phishing countermeasures depend strongly on vision, often inadequate for screen reader users. We conducted 10 semi-structured interviews and 14 lab-based sessions with screen reader users to understand their phishing experiences and defenses. Our work hints at opportunities for more accessible phishing prevention.
JoĂŁo Janeiro, SĂ©rgio Alves, Tiago Guerreiro, Florian Alt, Verena Distler
S&P 2024 â IEEE Security and Privacy
CLOCK4PD is a mono-centric, non-interventional observational study aiming at the molecular characterization of CR alterations in PD. We further plan to determine physiological modifications in sleep and activity patterns, and clinical factors correlating with the observed CR changes. Our study may provide valuable insights into the intricate interplay between CR and PD with a potential to be used as a predictor of circadian alterations reflecting distinct disease phenotypes, symptoms, and progression outcomes.
MĂŒge Yalçin, Ana Rita Peralta, Carla Bentes, Cristiana Silva, Tiago Guerreiro, Joaquim J. Ferreira, Angela RelĂłgio
Plos One 2024 âÂ
A magazine article expressing the need to integrate computational thinking in schools curricula, in particular implementing inclusive, multisensory robotic environments in schools in Lisbon, Portugal.
Ana Pires, Filipa Rocha, Tiago Guerreiro, Hugo Nicolau
Interactions 2023 â ACM Interactions Magazine, July-August, 2024
We explored an approach whereby the robotâs agency is shifted to the older adults who lead the interaction by commanding a robotâs actions using interactive physical blocks (tangible blocks). We conducted sessions with 22 care home dwellers where they could exchange messages and objects using the robot. We reflect on the opportunities and challenges for increased user agency and the asymmetries that emerged from differing abilities and personality traits.
Hugo SimĂŁo, David Gonçalves, Ana C. Pires, LĂșcia Abreu, Alexandre Bernardino, Jodi Forlizzi and Tiago Guerreiro
International Journal of Social Robotics 2024 â IJSR
This study explored the relationships between gait characteristics derived from an inertial measurement unit (IMU) and patient-reported fatigue in the IDEA-FAST feasibility study. Participants with neurodegenerative and immune-mediated infammatory disorders wore a lower-back IMU continuously for up to 10 days at home. Concurrently, participants completed PROs (physical fatigue and mental fatigue) up to four times a day.
Chloe Hinchliffe, Rana Zia Ur Rehman, Clemence Pinaud, Diogo Branco, Dan Jackson, Teemu Ahmaniemi, Tiago Guerreiro, et al
BMC JNR 2024 â Journal of NeuroEngineering and Rehabilition
Charts on the web are often inaccessible to screen reader users due to the lack of expertise and time data visualization experts have for creating accessible charts. To address this, we developed AutoVizuA11y, a tool that automates accessibility features for web-based charts, generating human-like descriptions, statistical insights, and providing keyboard navigation. In usability tests with fifteen screen reader users, thirteen praised AutoVizuA11y for its intuitive design and rich information, achieving an average task completion time of 66 seconds and a success rate of 89%. The tool received an âExcellentâ SUS score of 83.5/100, and data visualization experts appreciated its ease of use and suggested expanding its support to other technologies.
Diogo Duarte, Rita Costa, Pedro Bizarro, Carlos Duarte
EuroVis 2024 â Eurographics Conference on Visualization
Many Virtual Reality (VR) locomotion techniques have been proposed, but those explored for and with blind people are often custom-made or require specialized equipment. We implemented three popular techniques â Arm Swinging, Linear Movement, and Point & Teleport â with minor adaptations for accessibility. We conducted a study with 14 blind participants consisting of navigation tasks with these techniques and a semi-structured interview. We found no differences in overall performance, but contrasting preferences. We discuss how augmenting the techniques enabled blind people to navigate in VR, the greater control of movement of Arm Swinging, the simplicity and familiarity of Linear Movement, and the potential for efficiency and for scanning the environment of Point & Teleport.
Renato Alexandre Ribeiro, InĂȘs Gonçalves, Manuel Piçarra, LetĂcia Seixas Pereira, Carlos Duarte, AndrĂ© Rodrigues, JoĂŁo Guerreiro
CHI 2024 â ACM Conference on Human Factors in Computing Systems, May, 2024
In this work, we introduce the Living Framework for Cooperative Games (LFCG), a framework derived from a multi-step systematic analysis of 129 cooperative games with contributions of eleven researchers. We describe how LFCG can be used as a tool for analyses and ideation, and as a shared language for describing a gameâs design. LFCG is published as a web application to facilitate use and appropriation. It supports the creation, dissemination and aggregation of game reports and specifications; and enables stakeholders to extend and publish custom versions. Lastly, we discuss using a research-driven approach for formalising game structures and the advantages of community contributions for consolidation and reach.
Pedro Pais, David Gonçalves, Daniel Reis, João Godinho, João Morais, Manuel Piçarra, Pedro Trindade, Dmitry Alexandrovsky, Kathrin Gerling, João Guerreiro, André Rodrigues
CHI 2024 â ACM Conference on Human Factors in Computing Systems, May, 2024
Providing care to individuals with chronic diseases benefits from a multidisciplinary approach and longitudinal symptom, event, and disease monitoring, in and out of clinical facilities. This paper explores the challenges and opportunities of multidisciplinary clinical dashboards to support clinicians caring for people with chronic diseases. We report on a focus group and co-design workshops with a multidisciplinary team of clinicians and HCI researchers. We offer insights into how technological outcomes and visualizations can enhance clinical practice and the intricacies of information-sharing dynamics. We discuss the potential of dashboards to trigger actions in clinical settings and emphasize the benefits of customizable dashboards.
Diogo Branco, Margarida MĂłteiro, Raquel Bouça, Rita Miranda, Tiago Reis, ,Ălia Decoroso, Rita Cardoso, Joana Ramalho, Filipa Rato, Joana Malheiro, Diana Miranda, VerĂłnica Caniça, Filipa Pona-Ferreira, Daniela Guerreiro, Mariana LeitĂŁo, Alexandra SaĂșde Braz, Joaquim Ferreira, Tiago Guerreiro
CHI 2024 â ACM Conference on Human Factors in Computing Systems, May, 2024
While web accessibility evaluations have received extensive attention, evaluating mobile applications remains an open question. In our paper, we explore this issue through four studies: analyzing accessibility reports from European Member-states, interviewing accessibility experts, conducting manual evaluations, and performing usability tests with users having disabilities. Our findings reveal significant limitations in current evaluation methods, primarily due to the absence of authoritative guidelines and standards. We propose a set of recommendations aimed at improving the evaluation methodologies for assessing mobile applicationsâ accessibility.
LetĂcia Seixas Pereira, Maria Matos, Carlos Duarte
CHI 2024 â ACM Conference on Human Factors in Computing Systems, May, 2024
Disparate skill levels or expertise may result in unbalanced multiplayer experiences, where players feel frustrated, unchallenged, or left out. Some games employ player balancing mechanisms, such as matchmaking to group players according to their rank or, in racing games, players who lag behind receiving powerful boosts to catch up. We add to the understanding of player balancing in multiplayer gaming. First with a theoretical model that captures seven high-level design categories. Second, with a study where participant pairs experienced and gave their perspectives on seven different balancing mechanics in a racing game. Our results outline the importance of preserving a sense of merit and agency, while avoiding an obtrusive effect on the gameplay.
David Gonçalves, Daniel Barros, Pedro Pais, João Guerreiro, Tiago Guerreiro, André Rodrigues
CHI 2024 â ACM Conference on Human Factors in Computing Systems, May, 2024
This paper introduces SONAAR, a tool that merges automated techniques with user involvement to improve social media accessibility. SONAAR is designed to assist users in creating accessible content by providing both automated suggestions and manual input options. The study evaluates the toolâs impact through a series of user studies and log analysis, examining how well it supports users in producing accessible content and promotes awareness of accessibility practices. The findings highlight the toolâs potential to enhance accessibility efforts on social media platforms.
LetĂcia Seixas Pereira, JoĂŁo Guerreiro, AndrĂ© Rodrigues, Tiago Guerreiro, Carlos Duarte
TACCESS 2024 â ACM Transactions on Accessible Computing (TACCESS)
We analysed the role of non-clinical factors (i.e. computer confidence and computer self-efficacy) in the interaction experience (IX) and the feasibility of a digital neuropsychological platform called NeuroVRehab.PT in a group of older adults with varying levels of computer confidence. This study shed light on the barriers raised by non-clinical factors in adopting and using digital healthcare services by older adults. Furthermore, we did a critical analysis of the platformâs features that promote user adoption, and presented suggestions for overcoming limitations.
Filipa Ferreira-Brito, SĂ©rgio Alves, Tiago Guerreiro, Osvaldo Santos, CĂĄtia Caneiras, LuĂs Carriço, Ana Verdelho
Digital Health 2024 â DH 2024
The paper presents QualState, a tool designed to address accessibility evaluation challenges in Single Page Applications (SPAs). By identifying and exploring various states within SPAs, QualState integrates with the automated evaluation tool QualWeb to assess accessibility across dynamic web content. The tool enhances evaluation accuracy by uncovering additional interactive elements often missed by conventional methods. Initial testing demonstrates increased coverage of accessibility issues, showcasing QualStateâs potential to enhance automated accessibility evaluations in modern web environments.
Filipe Rosa Martins, LetĂcia Seixas Pereira, Carlos Duarte
W4A 2024 â Web for All Conference, May, 2024
In this paper we explore web accessibility as a fundamental human right, emphasizing its role in enabling participation in an increasingly digitalized society for individuals with impairments. It highlights how accessibility benefits all users, challenges the perception of disability as exclusive to âothers,â and examines its implementation barriers. We also address the importance of accessibility for businesses, ethical considerations, and legal obligations while advocating for broader societal commitment to inclusive design. The study underscores the need for practical measures to ensure a universally accessible digital environment.
Carlos SimĂ”es, LetĂcia Seixas Pereira, Carlos Duarte
HCII 2024 â International Conference on Human-Computer Interaction, July, 2024
This study investigates the evaluation and monitoring of digital accessibility for mobile applications, a crucial issue as mobile platforms increasingly become mainstays in daily communication and work. It reviews current methodologies and tools used across Europe, highlighting the challenges and inconsistencies in existing practices. The research integrates findings from multiple EU member states, providing insights through interviews with professionals in the field. Our analysis reveals significant gaps in standardization and points towards the urgent need for enhanced methods and tools to ensure universally accessible mobile applications.
Maria Matos, LetĂcia Seixas Pereira, Carlos Duarte
HCII 2023 â International Conference on Human-Computer Interaction, July, 2023
We investigate the impacts of optimising the page selection processes of large-scale web accessibility evaluations. We conducted an automated analysis of 987 websites using the `Home+â sample method as our baseline; then compare the agreement rates of web accessibility evaluations on further sub-sampled datasets. Our findings demonstrate that strong agreement could be reached with a sub-sample of just 30% of the pages, significantly reducing the effort and resources required to conduct large-scale web accessibility evaluations.
LuĂs Carvalho, Tiago Guerreiro, Shaun Lawson, Kyle Montague
ASSETS 2023 â ACM Conference on Computers and Accessibility
This paper reports the results of the automated accessibility evaluation of nearly three million web pages. The analysis of the evaluations allowed us to characterize the status of web accessibility. On average, we identified 30 errors per web page, and only a very small number of pages had no accessibility barriers identified. The more frequent problems found were inadequate text contrast and lack of accessible names. Additionally, we identified the technologies present in the websites evaluated, which allowed us to relate web technologies with the accessibility level, as measured by A3, an accessibility metric. Our findings show that most categories of web technologies impact the accessibility of web pages, but that even for those categories that show a negative impact, it is possible to select technologies that improve or do not impair the accessibility of the web content.
Beatriz Martins, Carlos Duarte
UAIS 2023 â Universal Access in the Information Society
The current study investigated the use of gait variability in the âreal worldâ to identify patient fatigue and daytime sleepiness. Inertial measurement units were worn on the lower backs of 159 participants (117 with six different immune and neurodegenerative disorders and 42 healthy controls) for up to 20 days, whom completed regular PROs.
Chloe Hinchliffe, Rana Zia Ur Rehman, Diogo Branco, Dan Jackson, Teemu Ahmaniemi, Tiago Guerreiro, et al
IEEE EMBC 2023 â IEEE Engineering in Medicine and Biology Society
We present TACTOPI, an inclusive and playful multisensory environment that leverages tangible interaction and a robot as the main character. We investigate how TACTOPI supports play in 10 dyads of children with mixed visual abilities. We also contribute with a playful multisensory environment, an analysis of the efect of its components on social, cognitive, and inclusive play, and design considerations for inclusive multisensory environments that prioritize play.
Ana Pires, LĂșcia Abreu, Filipa Rocha, Hugo SimĂŁo, JoĂŁo Guerreiro, Tiago Guerreiro, Hugo Nicolau
IDC 2023 â ACM Interaction Design and Children, June, 2023
In this work, we analyze over 70 hours of YouTube videos, where blind content-creators play visual-centric games. We point out the various strategies employed by players to overcome barriers that permeate mainstream games. We reflect on ways to enable and improve blind playersâ experience with these games, shedding light on the positive and negative consequences of apparently benign design choices. Our observations underline how game elements are appropriated for accessibility, the incidental consequences of audio design, and the trade-offs between accessibility, agency, and engagement.
David Gonçalves, Manuel Piçarra, Pedro Pais, João Guerreiro, André Rodrigues
CHI 2023 â ACM Conference on Human Factors in Computing Systems, April, 2023
Best Paper Award
We investigated the tradeoffs between remote and co-located collaboration through a tangible coding kit. We asked ten pairs of mixed-visual ability children to collaborate in an interdependent and asymmetric coding game. We contribute insights on six dimensions - effectiveness, computational thinking, accessibility, communication, cooperation, and engagement - and reflect on differences, challenges, and advantages between collaborative settings related to communication, workspace awareness, and computational thinking training. Lastly, we discuss design opportunities of tangibles, audio, roles, and tasks to create inclusive learning activities in remote and co-located settings.
Filipa Rocha, Filipa Correia, Isabel Neto, Ana Pires, JoĂŁo Guerreiro, Tiago Guerreiro, Hugo Nicolau
CHI 2023 â ACM Conference on Human Factors in Computing Systems, April, 2023
In this preliminary study, we examine the possibility of using smart glasses equipped with Inertial Measurement Unit (IMU) sensors for providing objective information on the motor state of PD patients. Data was collected from seven patients with PD with varying levels of symptom severity, who performed a total of 35 trails of the Timed-Up-and-Go (TUG) test while wearing the glasses. Findings suggest that smart glasses have the potential for unobtrusive and continuous screening of PD patientsâ gait, enhancing the medical assessment and treatment.
Ivana Kiprijanovska, Filip Panchevski, Simon Stankoski, Martin Gjoreski, James Archer, John Broulidakis, Ifigeneia Mavridou, Bradley Hayes, Tiago Guerreiro, Charles Nduka, and Hristijan Gjoreski
MIPRO 2023 â 46th MIPRO ICT and Electronics Convention
Recent technological advances have led to the development of sensors that can potentially connect patients and their care team beyond the traditional, and brief, clinical visit, improving accessibility and continuity of care. In this chapter, we examine the basic concepts related to sensor use in movement disorders and discuss the opportunities and challenges they represent for clinical practice and research.
Raquel Bouça-Machado, Linda Azevedo Kaupilla, Tiago Guerreiro, Joaquim J. Ferreira
Chapter 2023 â International Review of Movement Disorders
We explore a set of techniques that augment or are even embedded in the game design to facilitate navigation and spatial awareness of virtual environments. We conducted a user study where seven blind participants faced a number of navigational tasks in a virtual environment with these techniques and shared their perspectives on the experience. We contribute with an exploration of a catalog of techniques used to facilitate the navigation of virtual spaces and a reflection of their impact on playersâ experience, highlighting avenues for future work in the field.
Manuel Piçarra, André Rodrigues, João Guerreiro
CHI EA 2023 â Extended Abstracts of the ACM Conference on Human Factors in Computing Systems, April, 2023
Social virtual environments are becoming more prevalent, replicating and sometimes replacing real-world interactions. Nowadays, such environments are not accessible and end up excluding blind people, due to their strong visual components. In this study, we designed and explored multiple navigation and feedback techniques assessing social acceptability, ease of use, and efficiency. We developed a virtual environment composed of six scenarios to analyze different navigation methods (Free Exploration, Teleport, Auto-Walk, and Co-Pilot) and awareness cues in group conversations (Audio Cues While In-Group Footsteps and In-Group Teleport), and conducted a user study with 8 blind and 8 sighted participants. Our results indicate that participants tend to privilege autonomy and room awareness over efficiency and navigation ease and disapprove of intrusive actions that may jeopardize privacy.
InĂȘs Gonçalves, AndrĂ© Rodrigues, Tiago Guerreiro, JoĂŁo Guerreiro
CHI EA 2023 â Extended Abstracts of the ACM Conference on Human Factors in Computing Systems, April, 2023
Following the success of open software repositories, we present a novel community-based customization system where users can: 1) customize UIs for the self and others â using a customization toolkit; 2) use and further adapt public customization templates â found in an online repository; or 3) request customization assistance. We explored this concept in the context of Web technologies by developing GitUI. GitUI was iteratively developed and evaluated over two deployment phases. In a two-phase study (n=9), experts and non-experts 1) used, for two weeks, the customization toolkit; and 2) explored the repository.
SĂ©rgio Alves, Ricardo Costa, Kyle Montague, Tiago Guerreiro
CHI EA 2023 â Extended Abstracts of the ACM Conference on Human Factors in Computing Systems, April, 2023
This position paper focuses on the democratization of data-driven healthcare and addresses three key topics: data availability and clinical utility, agency and negotiation, and data minimization. We refer to our prior work on two projects, DataPark and Cue Band, as examples of efforts to democratize healthcare data. We propose new ideas for exploring these topics and promoting the democratization of healthcare data.
Diogo Branco, Tiago Guerreiro, Kyle Montague, LuĂs Carvalho, Lorelle Dismore, Richard Walker, Dan Jackson, Raquel Bouça and Joaquim Ferreira
IDDHI 2023 â CHIâ23 workshop on Intelligent Data-Driven Health Interfaces
In this position paper, we reflect about the challenges of adoption of technology for older adults, and share our experiences with universities for older adults.
Filipa Ferreira-Brito
CHI Workshop 2023 â Bridging HCI and Implementation Science for Innovation Adoption and Public Health Impact Workshop at CHI, April, 2023
This paper aims to describe the childrenâs dietary pattern at baseline of the SmartFeeding4Kids (SF4K) program, focusing on the intake of added sugars, fruits, vegetables, and legumes. We conclude that Fruit was the group with the highest daily intake among children, followed by added sugar foods. All children did not meet calcium, vitamin B12 and vitamin D intake recommendations. Our findings further justify the need for dietary interventions in this field, to improve young childrenâs diets.
Sofia Charneca, Ana Isabel Gomes, Diogo Branco, Tiago Guerreiro, LuĂsa Barros, Joana Sousa
Frontiers in Nutrition 2023 âÂ
In this paper, the authors propose a design space to explore how to augment objects and their behaviours with an audio representation in order to make virtual environments more accessible to blind people. The authors then explored this design space in the context of two VR Boxing applications in user studies with 16 blind participants, finding several engaging approaches for the audio representation of virtual objects (e.g., the opponentâs hands when attacking or defending).
João Guerreiro, Yujin Kim, Rodrigo Nogueira, SeungA Chung, André Rodrigues, Uran Oh
IEEE VR 2023 â IEEE Conference on Virtual Reality and 3D User Interfaces, March, 2023
This research will deploy CueBand, a discrete and comfortable wrist-worn device designed to work with a smartphone application to support the real-world evaluation of haptic cueing for the management of drooling. We will recruit 3,000 PwP to wear the device day and night for the intervention period to gain a greater understanding of the effectiveness and acceptability of the technology within real-world use. Additionally, 300 PwP who self-identity as having an issue with drooling will be recruited into an intervention study to evaluate the effectiveness of the wrist-worn CueBand to deliver haptic cueing (3-weeks) compared with smartphone cueing methods (3-weeks). PwP will use our smartphone application to self-assess their drooling frequency, severity, and duration using visual analogue scales and through the completion of daily diaries. Semi-structured interviews to gain feedback about utility of CueBand will be conducted following participants completion of the intervention.
Lorelle Dismore,Kyle Montague ,Luis Carvalho,Tiago Guerreiro,Dan Jackson,Yu Guan,Richard Walker
Plos One 2023 âÂ
Evaluating the accessibility of web resources is usually done by checking the conformance of the resource against a standard or set of guidelines (e.g., the WCAG 2.1). The result of the evaluation will indicate what guidelines are respected (or not) by the resource. While it might hint at the accessibility level of web resources, often it will be complicated to compare the level of accessibility of different resources or of different versions of the same resource from evaluation reports. Web accessibility metrics synthesize the accessibility level of a web resource into a quantifiable value. The fact that there is a wide number of accessibility metrics, makes it challenging to choose which ones to use. In this paper, we explore the relationship between web accessibility metrics. For that purpose, we investigated eleven web accessibility metrics. The metrics were computed from automated accessibility evaluations obtained using QualWeb. A set of around three million web pages were evaluated. By computing the metrics over this sample of nearly three million web pages, it was possible to identify groups of metrics that offer similar results. Our analysis shows that there are metrics that behave similarly, which, when deciding what metrics to use, assists in picking the metric that is less resource intensive or for which it might be easier to collect the inputs.
Beatriz Martins, Carlos Duarte
UAIS 2022 â Universal Access in the Information Society
This workshop aims to promote the exchange of experiences, knowledge, and know-how on strategies to develop effective and accessible VR tools for diagnosis, intervention, rehabilitation, and monitoring of health and wellbeing.
Filipa Brito, Hristijan Gjoreski, Oscar Mayora, Mitja LuĆĄtrek, Emilija Kizhevska, JoĂŁo Guerreiro, Kathrin Gerling, Sergi BermĂșdez i Badia, Tiago Guerreiro
VR4Health 2022 â Workshop on Virtual Reality for Health and Wellbeing at MUM 2022
We conducted a narrative review focusing on both VR exposure for children and adolescents and sensorsâ use for VR exposure. Virtual reality exposure therapy (VRET) seems to have similar results to other forms of exposure. Additionally, sensors managed to obtain an objective picture, which allows the therapist to get some objective measures during therapy. Although cybersickness seems to not be a major side effect in children, other limitations such as fear of the equipment and lack of adaptability were identified.
JoĂŁo Ferreira, Filipa Brito, JoĂŁo Guerreiro, Tiago Guerreiro
VR4Health 2022 â Workshop on Virtual Reality for Health and Wellbeing at MUM 2022
We conducted a narrative review of studies focused on using VR to elicit empathy. Considering the synthesized literature, we identified three contexts where VR systems have been used as a tool to study empathic behavior, namely: 1) to promote pro-environmental behavior; 2) to promote prosocialbehavior toward specific social groups (e.g., refugees); and 3) to medical training to promote empathy and more in-depth knowledge of clinical condition
Emilija Kizhevska, Filipa Brito, Tiago Guerreiro, Mitja LuĆĄtrek
VR4Health 2022 â Workshop on Virtual Reality for Health and Wellbeing at MUM 2022
This work investigates the feasibility of capturing continuous physiological signals from an electrocardiography-based wearable device for remote monitoring of fatigue and sleep and quantifies the relationship of objective digital measures to self-reported fatigue and sleep disturbances. Furthermore, it underscores the promise and sensitivity of novel digital measures from multimodal sensor time-series to differentiate chronic patients from healthy individuals and monitor their HRQoL. Therefore, it provides clinicians with realistic insights of continuous at home patient monitoring and its practical value in quantitative assessment of fatigue and sleep, an area of unmet need.
Emmi Antikainen, Haneen Njoum, Jennifer Kudelka, Diogo Branco, Rana Zia Ur Rehman, Victoria Macrae, Kristen Davies, Hanna Hildesheim, Kirsten Emmert, Ralf Reilmann, C. Janneke van der Woude, Walter Maetzler, Wan-Fai Ng, Patricio OâDonnell, Geert Van Gassen, FrĂ©dĂ©ric Baribaud, Ioannis Pandis, Nikolay V. Manyakov, Mark van Gils, Teemu Ahmaniemi and Meenakshi Chatterjee on behalf of the IDEA-FAST project consortium
Frontiers 2022 â Frontiers in Physiology
In our work, we try to estimate the MDS-UPDRS part III score from accelerometer data. We collected data from 74 patients using the Axitvity AX3 device both on the wrist and lower back. We did experiments with different models, features, and windows size. We achieved a 4.26 Mean Absolute Error on the on left out 10% data using both devices with a 2.5-second sliding window and a random forest model for prediction. We contribute with a comparison of the performed experiments and provide, according to our experiments, the optimal models for MDS-UPDRS part III estimation using only accelerometer data.
Vitor Lobo, Diogo Branco, Tiago Guerreiro, Raquel Bouça-Machado, Joaquim Ferreira, and the CNS Physiotherapy Study Group
PHSS 2022 â Pervasive Health and Smart Sensing at Information Society 2022
We sought to understand how people are perceiving this type of online content in their networks and how support tools are being used. To do so, we conducted a user study, with 258 social network users through an online questionnaire, followed by interviews with 20 of them â 7 blind users and 13 sighted users. Results show how the different approaches being employed by major platforms may not be sufficient to address this issue properly. Our findings reveal that users are not always aware of the possibility and the benefits of adopting accessible practices. From the general perspectives of end-users experiencing accessible practices, concerning barriers encountered, and motivational factors, we also discuss further approaches to create more user engagement and awareness.
LetĂcia Seixas Pereira, JosĂ© Coelho, AndrĂ© Rodrigues, JoĂŁo Guerreiro, Tiago Guerreiro, Carlos Duarte
ASSETS 2022 â ACM Conference on Computers and Accessibility
We present findings from a qualitative interview study with 6 IT instructors depicting their practices, experiences, and their views towards an inclusive future classroom.
Marta Carvalho, Filipa Rocha, JoĂŁo Guerreiro, Hugo Nicolau, Tiago Guerreiro, Ana Pires
ACM IDC Workshops 2022 â Co-designing with Mixed-ability Groups of Children to Promote Inclusive Education, 2022
In this half-day workshop, we will explore how to co-design technology in inclusive classrooms where children have diverse sensory, motor, cognitive or behavioral abilities. We will discuss barriers and opportunities in co-designing for inclusion, exploring techniques and tools to support learning in a collaborative environment. We encourage researchers, educators, parents, and other stakeholders to participate and provide their expertise and know-how in improving these environments, with an aim to support both inclusion and collaboration; and childrenâs exploration of their own interests and approaches to learning. We seek to better understand research experiences in these environments, co-design techniques that were successfully used, and what they can teach the broader field of interaction design for children.
Ana Pires, Isabel Neto, Emeline Brulé, Laura Malinverni, Oussama Metatla, Juan Pablo Hourcade
IDC 2022 â ACM Interaction Design and Children (IDC) Conference
We compare general machine learning (CNN and NN) methods with a fine-tuned personalised version of each one of them. This approach enables a model to be trained with a not-so-large general model, and then personalised with individual data in a fine-tuning step. We showed that the latter improved the overall accuracy by 3.5% for the NN, and 5.3% for the CNN, and that those that were outliers (i.e., with the worst accuracy) in the results of the general version of the models were on par with the recognition accuracy expected from the larger group.
Leon Ingelse, Diogo Branco, Hristijan Gjoreski, Tiago Guerreiro, Raquel Bouça-Machado, Joaquim J. Ferreira, and The CNS Physiotherapy Study Group
Sensors 2022 â Special Issue Application of Wearable Technology for Neurological Conditions, 2022
Typing on mobile devices is a common and complex task. The act of typing itself thereby encodes rich information, such as the typing method, the context it is performed in, and individual traits of the person typing. Researchers are increasingly using a selection or combination of experience sampling and passive sensing methods in real-world settings to examine typing behaviours. However, there is limited understanding of the effects these methods have on measures of input speed, typing behaviours, compliance, perceived trust and privacy. In this paper, we investigate the tradeoffs of everyday data collection methods. We contribute empirical results from a four-week field study (N=26). Here, participants contributed by transcribing, composing, passively having sentences analyzed and reflecting on their contributions. We present a tradeoff analysis of these data collection methods, discuss their impact on text-entry applications, and contribute a flexible research platform for in the wild text-entry studies
André Rodrigues, Hugo Nicolau, André Santos, Diogo Branco, Jay Rainey, David Verweij, Jan Smeddinck, Kyle Montague, Tiago Guerreiro
CHI 2022 â ACM Conference on Human Factors in Computing Systems, May, 2022
Best Paper Award
Value Sensitive HRI is a method based on design principles that consider the interleaved, dynamic, and sometimes conflicting stakeholdersâ values in human-robot interaction. We discuss how this approach will help design technology that better meets the values of all the stakeholders that surround a human-robot interaction and can even transfer agency from robots to people. We aim to share early insights regarding possible social impacts, identify under-explored real-world approaches and perspectives, and discuss future implementation challenges and guidelines for the shift to Value Sensitive HRI.
Hugo SimĂŁo, Alexandre Bernardino, Jodi Forlizzi, Tiago Guerreiro
HRI Workshops 2022 â Longitudinal Social Impacts of HRI over Long-Term Deployments @ HRI 2022, March, 2022
This work aims to describe the development and study protocol of the SmartFeeding4Kids (SF4K) program, an online self-guided 7-session intervention for parents of young (2â6 years old) children. The program is informed by social cognitive, self-regulation, and habit formation theoretical models and uses self-regulatory techniques as self-monitoring, goal setting, and feedback to promote behavior change. We propose to examine the intervention efficacy on childrenâs intake of fruit, vegetables, and added sugars, and parental feeding practices with a two-arm randomized controlled with four times repeated measures design (baseline, immediately, 3 and 6 months after intervention). Parental perceived barriers about food and feeding, food parenting self-efficacy, and motivation to change will be analyzed as secondary outcomes. The study of the predictors of parentsâ dropout rates and the trajectories of parentsâ and childrenâs outcomes are also objectives of this work.
Ana Isabel Gomes, Ana Isabel Pereira, Tiago Guerreiro, Diogo Branco, Magda Sofia Roberto, Ana Pires, Joana Sousa, Tom Baranowski, LuĂsa Barros
Trials 2021 â Clinical Trials
There has been an increase of behavior change applications, particularly in the areas of nutrition and fitness. Whereas most applications are focused on self-reporting by adults, there is limited work on designing digital programs for parents to improve their childrenâs food habits. In this paper, we present SmartFeeding4Kids, a digital platform co-designed within a team of psychologists, nutritionists, designers, and computer scientists, for nutritional behaviour change of children aged 2 to 6 years old. We present the main elements of our application, and main iterations of their design. Namely, we focus on mechanisms for user engagement (avatar, badges, notifications, and personalized feedback), 24-h food recall adapted to parent reporting, and overall digital workflow of the program.
Diogo Branco, Sergio Alves, Hugo SimĂŁo, Ana C. Pires, Ana Gomes, Ana Pereira, LuĂsa Barros, Tiago Guerreiro
ICGI 2021 â International Conference on Graphics and Interaction, November, 2021
Through a set of participatory design sessions with children with visual impairments and their educators, we understood current practices in maths teaching, and designed a novel system to support learning for this particular educational context. Sixteen children were engaged in 19 PD sessions to develop tangibles and auditory stimuli to represent numbers, and to explore activities to use through a tangible user interface.
Ana Cristina Pires, Ewelina Bakala, Fernando Gonzalez-Perilli, Gustavo Sansone, Bruno Fleischer, Sebastian Marichal, Tiago Guerreiro
IJCCI 2021 â International Journal of Child-Computer Interaction
We explore the use of games to inconspicuously train gestures. We designed and developed a set of accessible games, enabling users to practice smartphone gestures. We evaluated the games with 8 blind users and conducted remote interviews. Our results show how purposeful accessible games could be important in the process of training and discovering smartphone gestures, as they offer a playful method of learning. This, in turn, increases autonomy and inclusion, as this process becomes easier and more engaging.
Gonçalo Lobo, David Gonçalves, Pedro Pais, Tiago Guerreiro, André Rodrigues
ASSETS 2021 â ACM Conference on Computers and Accessibility
We present a smartphone tool that allows non-specialists to create navigable virtual environments by taking and linking sequences of panoramic photo spheres, analogly to Google Street View. Editing the environments is then possible in a web platform, myView, where text, images, videos, sounds, and pick-up objects can be added. myView allows users to navigate their environments as well as sharing those environments with others. In a preliminary study with two psychologists, where myView was used as an elicitation probe, the approach was found to be useful for creating meaningful activities for reminiscence and cognitive training. The platform showed to be promising in the democratization of the crafting of virtual environments.
SĂ©rgio Alves, Pedro Caldeira, Filipa Brito, LuĂs Carriço, Tiago Guerreiro
ASSETS 2021 â ACM Conference on Computers and Accessibility
We propose the design of a programming environment that leverages asymmetric roles to foster collaborative computational thinking activities for children with visual impairments, in particular mixed-visual-ability classes. The multimodal system comprises the use of tangible blocks and auditory feedback, while children have to collaborate to program a robot. We conducted a remote online study, collecting valuable feedback on the limitations and opportunities for future work, aiming to potentiate education and social inclusion.
Filipa Rocha, Guilherme GuimarĂŁes, David Gonçalves, Ana Cristina Pires, LĂșcia Abreu, Tiago Guerreiro
ASSETS 2021 â ACM Conference on Computers and Accessibility
We contribute with a human-powered nonvisual task assistant for smartphones to provide pervasive assistance. We argue, in addition to success, one must carefully consider promoting and evaluating factors such as self-efficacy and the belief in oneâs abilities to control and learn to use technology. In this paper, we show effective assistant positively affects self-efficacy when performing new tasks with smartphones, affects perceptions of accessibility and enables systemic task-based learning.
André Rodrigues, André Santos, Kyle Montague, Tiago Guerreiro
CSCW 2021 â ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2021
We present WildKey, an Android keyboard toolkit that allows for the usable deployment of in-the-wild user studies. WildKey is able to analyze text-entry behaviors through implicit and explicit text-entry data collection while ensuring user privacy. We detail each of the WildKeyâs components and features, all of the metrics collected, and discuss the steps taken to ensure user privacy and promote compliance.
André Rodrigues, André Santos, Kyle Montague, Hugo Nicolau, Tiago Guerreiro
WildByDesign 2021 â UbiComp/ISWC Workshop on Designing Ubiquitous Health Monitoring Technologies for Challenging Environments
In this workshop, we will focus on the challenges of real world health monitoring deployments to produce forward-looking insights that can shape the way researchers and practitioners think about health monitoring, in platforms and systems that account for the complex environments where they are bound to be used.
Diogo Branco, Patrick Carrington, Silvia Del Din, Afsaneh Doryab, Hristijan Gjoreski, Tiago Guerreiro, Roisin McNaney, Kyle Montague, Alisha Pradhan, André Rodrigues, Julio Vega
Wild by Design 2021 â Workshop on Designing Ubiquitous HealthMonitoring Technologies for Challenging Environments at Ubicomp 2021
We conducted a systematic review and meta-analysis study. PubMed, Web of Science, Epistemonikos, CENTRAL, and EBSCO electronic databases were searched for RCT (2000-2021) that analyzed the impact of VGs on cognitive and functional capacity outcomes in MCI/dementia patients. Nine studies were included (n = 409 participants), and Risk of Bias (RoB2) and quality of evidence (GRADE) were assessed. Data regarding attention, memory/learning, visual working memory, executive functions, general cognition, functional capacity, quality of life were identified, and pooled analyses were conducted. An effect favoring VGs interventions was observed on Mini-Mental State Examination (MMSE) score (MD = 1.64, 95%CI 0.60 to 2.69).
Ferreira-Brito, Filipa; Ribeiro, Filipa; Aguiar de Sousa, Diana; Costa, JoĂŁo; Caneiras, CĂĄtia; Carriço, LuĂs; Verdelho, Ana
JAD 2021 â Journal of Alzheimerâs Disease, 2021
Poor eating habits are one of todayâs significant menaces to public health. Child obesity is increasing, is a concerning reality, and needs to be appropriately addressed. However, most behavior change programs do not consider the needs of parents and their children, their profiles, and environments in the design of this type of intervention. We present the results of a workshop with dietists and clinical psychologists, professionals that deal with different parents and their childrenâs dietary problems, to understand parentsâ profiles, attitudes, and perceptions. The main contributions of this study are a set of personas, daily scenarios, and design considerations regarding behavior change programs that can be used to guide the creation of new digital programs. This formative contribution is of interest to researchers and practitioners designing digitized behavior change programs targeted at parents to improve their childrenâs habits.
Diogo Branco, Ana C. Pires, Hugo SimĂŁo, Ana Gomes, Ana Pereira, Joana Sousa, LuĂsa Barros, Tiago Guerreiro
INTERACT 2021 â International Conference on Human-Computer Interaction, September, 2021
We present the Cue Band study, which revolves around the creation of a wristband cueing device for people with Parkinsonâs that experience drooling. We present an approach for research in-the-wild, which draws on participatory action research theory, that places the end-user at the centre of the process, aiming to first and for most to create a workable product for the end-user, before engaging in a formal study. In the last section, we explore the appropriation of existing open-source hardware for in-the-wild research, by describing problems and solutions associated with developing Ubicomp technologies for large-scale studies.
LuĂs Carvalho, Dan Jackson, Tiago Guerreiro, Yu Guan, Kyle Montague
WildByDesign 2021 â UbiComp/ISWC Workshop on Designing Ubiquitous Health Monitoring Technologies for Challenging Environments
We present SONAAR, a project that aims to improve the accessibility of user-generated content on social networks. Our approach is to support the authoring and consumption of accessible social media content. Our prototypes currently focus on Twitter and Facebook and are available as an Android application and as a Chrome extension.
LetĂcia Seixas Pereira, JoĂŁo Guerreiro, AndrĂ© Rodrigues, AndrĂ© Santos, JoĂŁo Vicente, JosĂ© Coelho, Tiago Guerreiro, Carlos Duarte
SIGACCESS 2021 â Newsletter June Edition
We present ACCembly, an accessible block-based environment that enables children with visual impairments to perform spatial programming activities. ACCembly allows children to assemble tangible blocks to program a multimodal robot. We evaluated this approach with seven families that used the system autonomously at home. We contribute with an environment that enables children with visual impairments to engage in spatial programming activities, an analysis of parent-child interactions, and reflections on inclusive programming environments within a shared family experience.
Filipa Rocha, Ana Pires, Isabel Neto, Hugo Nicolau, Tiago Guerreiro
IDC 2021 â ACM Interaction Design and Children, June, 2021
Our work focuses on promoting awareness to accessible social media authoring practices and in assisting the authoring process. We have prototyped a Google Chrome extension and an Android application that can identify when a Twitter or a Facebook user is authoring content with images and suggests a text alternative for the image. In this paper, we highlight some of the challenges faced to offer this support in different technological platforms (web and mobile), but also ones that are raised by the domain characteristics (e.g. detecting the same image, supporting different languages) and that can be addressed through AI based technologies.
Carlos Duarte, LetĂcia Seixas Pereira, AndrĂ© Santos, JoĂŁo Vicente, AndrĂ© Rodrigues, JoĂŁo Guerreiro, JosĂ© Coelho and Tiago Guerreiro
WebSci 2021 â 13th ACM Web Science Conference
We explore how commodity objects and technologies can be repurposed to provide a multimodal programming environment that is accessible to children with visual impairments, flexible, and scalable to a variety of programming challenges. Our approach resorts to four main components: 1) a LEGO base plate where LEGO blocks can be assembled to create maps, which is flexible and robust for tactile recognition; 2) a tangible programming area where LEGOs, with 3D printed caps enriched with tactile icons, can be assembled to create a program; 3) alternatively, the program can be created through a voice conversation with the system; and 4) a low-cost OzoBot Bit
Gonçalo Cardoso, Ana Pires, LĂșcia Abreu, Filipa Rocha, Tiago Guerreiro
CHI EA 2021 â Extended Abstracts of the ACM Conference on Human Factors in Computing Systems, May, 2021
We present stories of research articulation, of researchers as articulated, and as researchers articulating, gesturing toward a crip HCI. Disability is a plural, fluid, transitory, embodied cultural experience. While crip theoretics of HCI are best shaped by disabled scholars, a crip practice affords and demands a broader uptake. The particulars and nuances of a crip HCI are still forming among the disabled HCI researchers in collaboration today. However, this practice of articulation within disabled community, disabled space, and disabled consciousness is an essential and ongoing process toward a more equitable, more just, more humane HCI practice.
Rua M. Williams, Kathryn Ringland, Amelia Gibson, Mahender Mandala, Arne Maibaum, Tiago Guerreiro
ACM Interactions 2021 â May-June
We explore ability-based asymmetric roles as a design approach to create engaging and challenging mixed-ability play. Our team designed and developed two collaborative testbed games exploring asymmetric interdependent roles. In a remote study with 13 mixed-visual-ability pairs we assessed how roles affected perceptions of engagement, competence, and autonomy, using a mixed-methods approach. The games provided an engaging and challenging experience, in which differences in visual ability were not limiting. Our results underline how experiences unequal by design can give rise to an equitable joint experience.
David Gonçalves, André Rodrigues, Mike Richardson, Alexandra de Sousa, Michael Proulx, Tiago Guerreiro
CHI 2021 â ACM Conference on Human Factors in Computing Systems, May, 2021
We performed an online survey of 258 social network users and a follow-up interview conducted with 20 of them - 7 of them self-reporting blind and 13 sighted users without a disability. Results show how the different approaches being employed by major platforms are still not sufficient to properly address social media accessibility. Our findings reveal that mainstream users are not aware of the possibility and the benefits of adopting accessible practices. From the general perspectives of end-users experiencing accessible practices, concerning barriers encountered, and motivational factors, we also discuss further approaches to create more user engagement and awareness.
Leticia Seixas Pereira, José Coelho, André Rodrigues, João Guerreiro, Tiago Guerreiro, Carlos Duarte
arxiv 2021 â arXiv:2104.10968 [cs.HC], April 2021
This talk builds on more than 14 years of deep engagements and in-the-wild deployments of mobile technologies within a community of blind people. It makes the case for pervasive assistive technology researchers to be experts in their areas of study: people, and then, technology to serve and empower people.
Tiago Guerreiro
MPAT 2021 â Workshop on Mobile and Pervasive Assistive Technologies (at IEEE Percom), March, 2021
Opening Keynote Address
We aimed to identify which kinematic and clinical outcomes better predict functional mobility changes when PD patients are submitted to a specialized multidisciplinary program.
Raquel Bouça-Machado, Diogo Branco, Gustavo Fonseca, Raquel Fernandes, Daisy Abreu, Tiago Guerreiro, Joaquim J Ferreira, Daniela Guerreiro, VerĂłnica Caniça, Francisco Queimado, Pedro Nunes, Alexandra SaĂșde, Laura Antunes, Joana Alves, Beatriz Santos, InĂȘs Lousada, Maria A Patriarca, PatrĂcia Costa, Raquel Nunes, Susana Dias
Frontiers in Neurology 2021 â Frontiers in Neurology
This paper aims to explore how the player actions of Klondike Solitaire relate to cognitive functions and to what extent the digital biomarkers derived from these player actions are indicative of MCI. First, 11 experts in the domain of cognitive impairments were asked to correlate 21 player actions to 11 cognitive functions. Expert agreement was verified through intraclass correlation, based on a 2-way, fully crossed design with type consistency. On the basis of these player actions, 23 potential digital biomarkers of performance for Klondike Solitaire were defined. Next, 23 healthy participants and 23 participants living with MCI were asked to play 3 rounds of Klondike Solitaire, which took 17 minutes on average to complete. A generalized linear mixed model analysis was conducted to explore the differences in digital biomarkers between the healthy participants and those living with MCI, while controlling for age, tablet experience, and Klondike Solitaire experience. All intraclass correlations for player actions and cognitive functions scored higher than 0.75, indicating good to excellent reliability. Furthermore, all player actions had, according to the experts, at least one cognitive function that was on average moderately to strongly correlated to a cognitive function. Of the 23 potential digital biomarkers, 12 (52%) were revealed by the generalized linear mixed model analysis to have sizeable effects and significance levels. The analysis indicates sensitivity of the derived digital biomarkers to MCI. Commercial off-the-shelf games such as digital card games show potential as a complementary tool for screening and monitoring cognition.
Karsten Gielis, Marie-Elena Vanden Abeele, Robin De Croon, Paul Dierick, Filipa Ferreira-Brito, Lies Van Assche, Katrien Verbert, Jos Tournoy, Vero Vanden Abeele
JMIR 2021 â serious games
We investigated the feasibility and rehabilitation potential of a new design approach to create highly realistic interactive virtual environments for MCI patientsâ neurorehabilitation. Through a participatory design protocol, a neurorehabilitation digital platform was developed using images captured from a Portuguese supermarket (NeuroVRehab.PT). NeuroVRehab.PT main features (e.g., medium-size supermarket, use of shopping lists) were established accordingly to a shopping behavior questionnaire filled in by 110 older adults. Seven health professionals used the platform and assessed its rehabilitation potential, clinical applicability and user-experience.
Filipa Ferreira-Brito, SĂ©rgio Alves, Osvaldo Santos, Tiago Guerreiro, CĂĄtia Caneiras, LuĂs Carriço, Ana Verdelho
JCM 2020 â Journal of Clinical Medicine
Users are susceptible to privacy breaches when people close to them gain physical access to their phones. We present logging as a security response to this threat, one that is able to accommodate for the particularities of social relationships. To this end, and explore the feasibility of the logging approach, we present a prototype developed for Android that continuously gathers user interactions and translates them into human-readable units.
JosĂ© Franco, Ana C. Pires, LuĂs Carriço Tiago Guerreiro
ACSAC 2020 â Annual Computer Security Applications Conference
We present TACTOPI, a playful environment designed from the ground up to be rich in both its story (a nautical game) and its mechanics (e.g., a physical robot-boat controlled with a 3D printed wheel), tailored to promote computational thinking at different levels (4 to 8 years old). This poster intends to provoke discussion and motivate accessibility researchers that are interested in computational thinking to make playfulness a priority.
LĂșcia Abreu, Ana C. Pires, Tiago Guerreiro
ASSETS 2020 â ACM Conference on Computers and Accessibility
We share multiplayer gaming experiences of people with visual impairments collected from interviews with 10 adults and 10 minors, and 140 responses to an online survey. We include the perspectives of 17 sighted people who play with someone who has a visual impairment, collected in a second online survey. Our focus is on group play, particularly on the problems and opportunities that arise from mixed-visual-ability scenarios. These show that people with visual impairments are playing diverse games, but face limitations in playing with others who have different visual abilities.
David Gonçalves, André Rodrigues, Tiago Guerreiro
ASSETS 2020 â ACM Conference on Computers and Accessibility
Best Paper Nominee
We report on a focus group with IT and special needs educators, where they discussed a variety of programming environments for children, identifying their merits, barriers and opportunities. We then conducted a workshop with 7 visually impaired children where they experimented with a bespoke tangible robot-programming environment. Video recordings of such activity were analyzed with educators to discuss childrenâs experiences and emergent behaviours. We contribute with a set of qualities that programming environments should have to be inclusive to children with different visual abilities, insights for the design of situated classroom activities, and evidence that inclusive tangible robot-based programming is worth pursuing.
Ana Cristina Pires, Filipa Rocha, AntĂłnio Barros, Hugo SimĂŁo, Hugo Nicolau, Tiago Guerreiro
IDC 2020 â ACM Interaction Design and Children
We summarize and critically appraise the characteristics of technology-based gait analysis in PD and provide mean and standard deviation values for spatiotemporal gait parameters. These results provide useful information for performing objective technology-based gait assessment in PD, as well as mean values to better interpret the results.
Raquel Bouça-Machado, Constança Jalles, Daniela Guerreiro, Filipa Pona-Ferreira, Diogo Branco, Tiago Guerreiro, Ricardo Matias, Joaquim J. Ferreira
JPD 2020 â Journal of Parkinsonâs Disease
Through a multiple methods approach we identify and validate challenges locally with a diverse set of user expertise and devices, and at scale through the analyses of the largest Android and iOS dedicate forums for blind people. We contribute with a prioritized corpus of smartphone challenges for blind people, and a discussion on a set of directions for future research that tackle the open and often overlooked challenges.
André Rodrigues, Hugo Nicolau, Kyle Montague, João Guerreiro and Tiago Guerreiro
IJHCI 2020 â International Journal of Human Computer Interaction
With this research topic, we explore a robot as a communication vehicle for older adults in care homes. We extend older peopleâs actions and increase their communication through a robot traveling across the institution. This robot is programmable by older people using 3D printed, tangible blocks with default actions to build sequences. This way, people are in charge of the approach and interaction to perform with other people inside the institution. Besides the improvement in communication for the general people institutionalized, the technique showed to be promising for people with mobility impairments to extend their action range.
Hugo Simão, Ana Cristina Pires, David Gonçalves, Tiago Guerreiro
HRI 2020 â Companion of the 2020 ACM/IEEE International Conference on Human-Robot Interaction (HRI â20 Companion)
Best paper award
We investigated if and how in-context human-powered solutions can be leveraged to improve current smartphone accessibility and ease of use. The thesis of this dissertation is: Human-powered smartphone assistance by non-experts is effective and impacts perceptions of self-efficacy.
André Rodrigues
PhD Thesis 2020 â Advisors: Tiago Guerreiro, Kyle Montague
Word completion interfaces are ubiquitously available in mobile virtual keyboards; however, there is no prior research on how to design these interfaces for screen reader users. In addressing this, we propose a design space for nonvisual representation of word completions. The design space covers seven categories aiming to identify challenges and opportunities for interaction design in an unexplored research topic.
Hugo Nicolau, André Rodrigues, André Santos, Tiago Guerreiro, Kyle Montague, João Guerreiro
ASSETS 2019 â In The 21st International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS â19). ACM, New York, NY, USA, 249-261.
Best Paper Nominee
iCETA, an inclusive interactive system for math learning, designed through a set of participatory sessions with visually impaired children and their educators. iCETA supports math learning through the combination of tangible interaction with haptic and auditory feedback.
Ana Cristina Pires, Sebastian Marichal, Fernando Gonzalez-Perilli, Ewelina Bakala, Bruno Fleischer, Gustavo Sansone, Tiago Guerreiro
ASSETS 2019 â 21th International ACM SIGACCESS Conference on Computers and Accessibility. Pittsburgh, PA, USA. October, 2019
We sought to understand how sighted and blind people instruct other blind users to accomplish tasks on a mobile device. We also studied how those instructions enabled blind people to be successful. Results showed that a single pass of instructions was limited. A set of ways in which support can be provided is discussed.
André Rodrigues, André Santos, Kyle Montague, Hugo Nicolau, Tiago Guerreiro
INTERACT 2019 â 17th IFIP TC13 International Conference on Human-Computer Interaction, Paphos, Cyprus, September, 2019
Game-based interventions (GBI) have been used to promote health-related outcomes, including cognitive functions. Criteria for game-elements (GE) selection are insufficiently characterized in terms of their adequacy to patientsâ clinical conditions or targeted cognitive outcomes. This study aimed to identify GE applied in GBI for cognitive assessment, training or rehabilitation. A systematic review of literature was conducted. Papers involving video games were included if: (1) presenting empirical and original data; (2) using video games for cognitive intervention; and (3) considering attention, working memory or inhibitory control as outcomes of interest. Ninety-one papers were included. A significant difference between the number of GE reported in the assessed papers and those composing video games was found (pâŻ<âŻ.001). The two most frequently used GE were: score system (79.2% of the interventions using video games; for assessment, 43.8%; for training, 93.5%; and for rehabilitation, 83.3%) and narrative context (79.2% of interventions; for assessment, 93.8%; for training, 73.9% and for rehabilitation, 66.7%). Usability assessment was significantly associated with six of the seven GE analyzed (p-values between pâŻâ€âŻ0.001 and p.âŻ=âŻ027). The use of GE that act as extrinsic motivation promotors (e.g., numeric feedback system) may jeopardize patientsâ long-term adherence to interventions, mainly if associated with progressive difficulty-increase of gaming experience. Lack of precise description of GE and absence of a theoretical framework supporting GE selection are important limitations of the available clinical literature.
Ferreira-Brito, Filipa; Fialho, MĂłnica; Virgolino, Ana; Neves, InĂȘs; Miranda, Ana Cristina; Sousa-Santos, Nuno; Caneiras, CĂĄtia; Carriço, LuĂs; Verdelho, Ana; Santos, Osvaldo
JBI 2019 â Journal of Biomedical Informatics, 2019
It is indispensable that objects may be grasped, lifted and explored or would it be enough to interact with virtual manipulatives? And specifically, how the objectsâ affordances (i.e., the possibility to grasp physical objects or drag virtual ones) will shape and constrain childrenâs composing strategies.
Ana Cristina Pires, Fernando GonzĂĄlez Perilli, Ewelina BakaĆa, Bruno Fleisher, Gustavo Sansone and SebastiĂĄn Marichal
Frontiers in Education 2019 â Educational Psychology, 2019
Accessing the Web with mobile devices, either through a browser or a native application, has become more than a perk; it is a need. Such relevance has increased the need to provide accessible mobile webpages. In this work, we focus our attention on the challenges of mobile devices for accessibility, and how those have been addressed in the development and evaluation of mobile interfaces and contents.
Tiago Guerreiro, LuĂs Carriço, AndrĂ© Rodrigues
Web Accessibility 2019 â Chapter 38 in S. Harper & Y. Yesilada (eds.), Web Accessibility: A Foundation for Research (2nd ed.). London, England, Springer-Verlag.
Unauthorized physical access to personal devices by people known to the owner of the device is a common concern, and a common occurrence. But how do people experience incidents of unauthorized access? Using an online survey, we collected 102 accounts of unauthorized access. Participants wrote stories about past situations in which either they accessed the smartphone of someone they know, or someone they know accessed theirs.
Diogo Marques, Tiago Guerreiro, LuĂs Carriço, Ivan Beschastnikh, Konstantin Beznosov
CHI 2019 â ACM Conference on Human Factors in Computing Systems, Glasgow, Scotland, May, 2019
Using a research through design approach, we devised a robot focused on empowering people with Alzheimer and fostering their autonomy, from the initial sketch to a working prototype. MATY is a robot that encourages communication with relatives and promotes routines by eliciting the person to take action, using a multisensorial approach (e.g., projecting biographical images, playing suggestive sounds, or emitting soothing aromas). The paper reports the iterative, incremental design process performed together with stakeholders. We share first lessons learned in this process with HCI researchers and practitioners designing solutions, particularly robots, to assist people with dementia and their caregivers.
Hugo SimĂŁo, Tiago Guerreiro
CHI 2019 â In The CHI EA â19 Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems
The democratization of sensing wearable technologies opened several possibilities in the continuous monitoring of people in their homes. We developed a platform where usable reports are presented to clinicians, particuarly in the context of Parkinsonâs disease monitoring. The presented information originates from accelerometer sensors.
Diogo Branco, Raquel Bouça, Joaquim Ferreira, Tiago Guerreiro
CHI 2019 â Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems, Glasgow, UK
We developed a platform where usable reports are presented to clinicians, particuarly in the context of Parkinsonâs disease monitoring. The presented information originates from accelerometer sensors and subjective data collected over an Interactive Voice Response system.
Diogo Branco, César Mendes, Ricardo Pereira, André Rodrigues, Raquel Bouça, Kyle Montague, Joaquim Ferreira, Tiago Guerreiro
WISH Symposium 2019 â Workgrounp on Interactive Systems in Healthcare, co-located with CHIâ19, Glasgow, UK, May, 2019
We iteratively designed a web platform focused on personalized cognitive stimulation. The platform was deployed in clinical contexts for several months and iterated, being enriched with functionalities like group reminiscence, caregiver app, or biographical activities.
SĂ©rgio Alves, Andreia Cordeiro, Filipa Brito, LuĂs Carriço, Tiago Guerreiro
W4A 2019 â 16th International Web for All Conference, San Francisco, USA, May, 2019
Best Technical Paper Nominee
We presented a qualitative analysis of the expectations, fears and needs pointed by a sample of blind participants. In study 2, we implement and discuss the effect of two types of robotic assistance during the assembling task. Results from our two studies support the usefulness of developing and introducing this form of collaborative assistive technology in the lives of people with visual impairments. Positive outcomes for users (such as an increased level of autonomy in everyday life tasks) are outlined and discussed.
Mayara Bonani, Raquel Oliveira, Filipa Correia, André Rodrigues, Tiago Guerreiro, Ana Paiva
ASSETS 2018 â ASSETS 2018 - 20th International ACM SIGACCESS Conference on Computers and Accessibility, Galway, Ireland, October, 2018
AidMe, is a system-wide authoring and playthrough tool of non-visual interactive tutorials. Tutorials are created via user demonstration and narration. In a user study with 11 blind participants we identified issues with instruction delivery and user guidance providing insights into the development of accessible interactive non-visual tutorials.
André Rodrigues, Leonardo Camacho, Hugo Nicolau, Kyle Montague, Tiago Guerreiro
MOBILECHI 2018 â 20th International Conference on Human-Computer Interaction with Mobile Devices and Services, Barcelona, Spain, September, 2018
We present a smartphone case with physical buttons that allow users to write Braille in the back and gesture with the thumbs on the touchscreen. This enabled the study of novel editing approachs, very limited in commodity smartphones and accessibility services.
Daniel Trindade, André Rodrigues, Tiago Guerreiro, Hugo Nicolau
CHI 2018 â ACM Conference on Human Factors in Computing Systems, Montreal, Canada, May, 2018
Inspired by charitable donations, Data Donors, is a conceptual framework proposing the enablement of users with the capacity to help others to do so by donating their mobile interaction data and knowledge.
André Rodrigues, Kyle Montague, Tiago Guerreiro
CHI 2018 â Late Breaking Work - Extended Abstracts of the ACM Conference on Human Factors in Computing Systems, Montreal, Canada, May, 2018
In this paper we Introduce the initial development process of Scrapbook. After an initial study to understand current clinical practices, we developed a platform focused on enabling psychologists to perform reminiscence therapy with people with dementia. A two-week study was performed in a clinical environment.
SĂ©rgio Alves, Andreia Cordeiro, Filipa Brito, LuĂs Carriço, Tiago Guerreiro
CHI 2018 â Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems, Montreal QC, Canada
To perceive it is necessary to understand the role that our experiences play and how they are articulated with the biological mechanisms of information processing with which we come to the world. Perceiving is a complex process that is built from repeated exposure of our sensors to the response of the physical world with which we interact since we were born. In this chapter we will highlight this complex process based on the general functioning of our sensory processing, to then focus on the example of vision. It will deepen specific aspects of vision such as movement perception, of color or depth, to finally address the general problem that involves the necessary integration of the information that it is processed in different areas of the brain for the conformation of a single perception.
Alejandro Maiche, Ana Cristina Pires, Fernando Gonzalez, Lorena Chanes & Alejandro Vazquez
EMP 2018 â Editorial MĂ©dica Panamericana
We present an approach that superimposes a virtual overlay to all other interfaces ensuring interface consistency by re-structuring how content is accessed in every screen. The screen is splitted in two, dedicating half to a configurable set of static options regardless of context; while the other enables the standard content navigation gestures with the ability to re-order content and apply filters.
André Rodrigues, André Santos, Kyle Montague, Tiago Guerreiro
ASSETS 2017 â 19th International ACM SIGACCESS Conference on Computers and Accessibility. Baltimore, Maryland, USA, October, 2017
Hint Me! is a human-powered service that allows blind users to get in-app smartphone assistance. We conducted an exploratory user study with six blind participants to elicit their perceptions on the usefulness, and acceptance of human-powered networks for smartphone support.
André Rodrigues, Kyle Montague, Hugo Nicolau, João Guerreiro and Tiago Guerreiro
ASSETS 2017 â 19th International ACM SIGACCESS Conference on Computers and Accessibility. Baltimore, Maryland, USA, October, 2017.
With our rapid aging society, more and more people are suffering from dementia. This increase puts a great strain on the healthcare sector, as well in cost as manpower. This calls for research of reliable and regular assessments that can screen for Mild Cognitive Impairment (MCI), the precursor to dementia. We see that this call is answered with more and more cognitive screening games being developed. However, most of these games are based on existing tests, often lacking in adherence and enticing gameplay. This paper discusses the possibilities of meaningful play, and more specifically, Klondike Solitaire, as a cognitive screening test. We report on the results of an analysis of player actions in Solitaire with 3 health professionals that are experts in the domain of MCI. Results suggest that Klondike Solitaire can be used for such an assessment, and that this would be a valuable additional tool for longitudinal assessment.
Karsten Gielis, Filipa Brito, Jos Tournoy, Vero Vanden Abeele
CHI PLAY 2017 â CHI PLAY
This paper investigates whether Klondike Solitaire can be used as an assessment tool for mild cognitive impairment (MCI). It does so by providing a structured analysis and mapping player actions to cognitive functions. For Klondike Solitaire, 22 player actions were defined and mapped to 10 cognitive functions by 3 health professionals in the field of MCI. The results indicate that Attention, Executive Function, Object Recognition, Abstraction and Memory can be assessed through gameplay of Solitaire. Healthcare professionals confirmed that this can potentially be valuable, as it can screen for cognitive impairments longitudinally, in a non-intrusive way, without practice effects.
Karsten Gielis, Filipa Brito, Jos Tournoy, Vero Vanden Abeele
CHI PLAYâ 2017 â Extended Abstracts: Extended Abstracts Publication of the Annual Symposium on Computer-Human Interaction in Play, October 2017
we ran two MTurk studies about social insider attacks on Facebook. In the first (n = 1,308), using the list experiment method, we estimated that 24% of participants had perpetrated social insider attacks and that 21% had been victims (and knew about it). In the second study (n = 45), participants wrote stories detailing personal experiences with such attacks. Using thematic analysis, we typified attacks around five motivations (fun, curiosity, jealousy, animosity, and utility), and explored dimensions associated with each type. Our combined findings indicate that social insider attacks are common, often have serious emotional consequences, and have no simple mitigation
Wali Usmani, Diogo Marques, Ivan Beschastnikh, Konstantin Beznosov, Tiago Guerreiro, LuĂs Carriço
CHI 2017 â In the ACM Conference on Human Factors in Computing Systems, Denver, Colorado, USA, May
For 12 weeks, we collected field data, coupled with eight weekly laboratory sessions. This article provides a thorough analysis of everyday typing data and its relationship with controlled laboratory assessments.
Hugo Nicolau, Kyle Montague, Tiago Guerreiro, André Rodrigues Vicki L. Hanson
TACCESS 2017 â ACM Transactions on Accessible Computing (TACCESS) - Special Issue (Part 2) of Papers from ASSETS 2015
We investigate how nonvisual input performance, on touchscreens, varies with four QWERTY keyboard sizes (ranging from 15mm to 2.5mm). This paper presents an analysis of typing performance and touch behaviors discussing its implications.
AndrĂ© Rodrigues, Hugo Nicolau, Kyle Montague, LuĂs Carriço, Tiago Guerreiro
MobileHCI 2016 â â16 Proceedings of the 18th International Conference on Human-Computer Interaction with Mobile Devices and Services, Pages 47-52, Florence, Italy â September 06 - 09, 2016
Honorable mention
Through an anonymity-preserving survey experiment, we quantify the pervasiveness of snooping attacks, defined as looking through someone elseâs phone without their permission. We estimated the 1-year prevalence to be 31% in an online participant pool. Weighted to the U.S. population, the data indicates that 1 in 5 adults snooped on at least one other personâs phone, just in the year before the survey was conducted.
Diogo Marques, Ildar Muslukhov, Tiago Guerreiro, Konstantin Beznosov, LuĂs Carriço
SOUPS 2016 â In the Twelfth Symposium on Usable Privacy and Security, USA, June, 2016
Distinguished paper award
We report on a user study with 14 blind participants performing common touchscreen interactions using one and two-hand exploration. We investigate the exploration strategies applied by blind users when interacting with a tabletop. We identified six basic strategies that were commonly adopted and should be considered in future designs. We finish with implications for the design of accessible large touch interfaces.
Tiago Guerreiro, Kyle Montague, João Guerreiro, Rafael Nunes, Hugo Nicolau, Daniel Gonçalves
ITS 2015 â ACM International Conference on Interactive Tabletops and Surfaces, Madeira, Portugal, November, 2015
Best Paper Award
For eight weeks, we collected in-situ usage data and conducted weekly laboratory assessment sessions. This paper presents a thorough analysis of typing performance that goes beyond traditional aggregated measures of text-entry and reports on character-level errors and touch measures. Our findings show that users improve over time, even though it is at a slow rate (0.3 WPM per week).
Hugo Nicolau, Kyle Montague, André Rodrigues, Tiago Guerreiro, Vicki Hanson
ASSETS 2015 â 17th International ACM SIGACCESS Conference on Computers and Accessibility. Lisboa, Portugal, October, 2015
We conducted a twelve week in-the-wild longitudinal study with five novice blind users to understand the adoption process of smartphones. We characterized their concerns, barriers, support mechanisms and evolution throughout the eight week period.
André Rodrigues, Kyle Montague, Hugo Nicolau, Tiago Guerreiro
ASSETS 2015 â 17th International ACM SIGACCESS Conference on Computers and Accessibility. Lisboa, Portugal, October, 2015
HoliBraille is a system capable of localized vibrotactile feedback that can be combined with the input capabilities of mobile devices. We used a custom-made case and off-the-shelf vibrotactile actuators combined with dampening materials. The solution can be attached to mainstream touchscreen devices enabling direct feedback on usersâ fingers. In this paper, we contribute the following: 1) some application scenarios that can benefit from HoliBraille; 2) the design and technical description of the proposed device; and 3) an evaluation of HoliBraille on a foundational task for future Braille-related applications, i.e. character discrimination.# short description of the publication
Hugo Nicolau, Kyle Montague, Tiago Guerreiro, André Rodrigues and Vicki L Hanson
W4A 2015 â In Proceedings of the 12th Web for All Conference (W4A â15). ACM, New York, NY, USA, Article 30, 4 pages.
Our system combines spatial and simultaneous audio feedback with multitouch selection techniques to mimic traditional two-hand keyboard interaction. SpatialTouch enables blind users to rest their idle hand on a key (e.g. F or J), while simultaneously exploring the keyboard with their active hand and receiving auditory feedback about the character location.
João Guerreiro, André Rodrigues, Kyle Montague, Tiago Guerreiro, Hugo Nicolau, Daniel Gonçalves
CHI 2015 â ACM Conference on Human Factors in Computing Systems, Seoul, South Korea, April, 2015
B#, a novel correction system for multitouch Braille input that uses chords as the atomic unit of information rather than characters. Experimental results on data collected from 11 blind people revealed that B# is effective in correcting errors at character-level, thus providing opportunities for instant corrections of unrecognized chords; and at word-level, where it outperforms a popular spellchecker by providing correct suggestions for 72% of incorrect words (against 38%).
Hugo Nicolau, Kyle Montague, Tiago Guerreiro, JoĂŁo Guerreiro and Vicki L. Hanson
CHI 2014 â In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI â14). ACM, New York, NY, USA, 1705-1708.
Best paper award
UbiBraille consists of six vibrotactile actuators that are used to code a Braille cell and communicate single characters. The device is able to simultaneously actuate the usersâ index, middle, and ring fingers of both hands, providing fast and mnemonic output. We conducted two user studies on UbiBraille to assess both character and word reading performance. Character recognition rates ranged from 54% to 100% and were highly character- and user-dependent.
Hugo Nicolau, JoĂŁo Guerreiro, Tiago Guerreiro and Luis CarrĂço
ASSETS 2013 â In Proceedings of the 15th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS â13). ACM, New York, NY, USA, , Article 23 , 8 pages.
We present audio puzzle games, an interactive way of playing with music by rebuilding a song, just like the original image jigsaw puzzle, broken into pieces which are by turn randomly shuffled. The audio mode design followed a participatory approach starting from a version similar to the visual one, but around music instead of images. We report on an evaluation with 13 blind people using the proposed game application with three different songs randomly distributed.
Jaime Carvalho, LuĂs Duarte, Tiago Guerreiro, LuĂs Carriço
MOBACC 2012 â Mobile Accessibility Workshop at MobileHCI 2012
We present a study with 13 blind people consisting of a touch screen text-entry task with four different methods. Results show that different abilities (spatial ability, tactile perception, âŠ) have significant impact on performance and that this impact is related with the different methodsâ demands. These variations acknowledge the need of accounting for individual characteristics and giving space for difference, towards inclusive design.
João Oliveira, Tiago Guerreiro, Hugo Nicolau, Daniel Gonçalves, Joaquim Jorge
ASSETS 2011 â In The 13th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS â11). ACM, New York, NY, USA, 179-186.
Best Student Paper Award
We present BrailleType, a single-touch text-entry system for touch screen devices. BrailleType allows the blind user to enter text as if he was writing Braille using the traditional 6-dot matrix code. We performed a user study with fifteen blind subjects, to assess this methodâs performance against Appleâs VoiceOver approach. BrailleType although slower, was significantly easier and less error prone
João Oliveira, Tiago Guerreiro, Hugo Nicolau, Joaquim Jorge, and Daniel Gonçalves
INTERACT 2011 â INTERACT 2011: Human-Computer Interaction â INTERACT 2011 pp 100-107
In this paper, we describe a long-term evaluation of the NavTap prototype, a mobile device system for the blind with a navigation text-entry method as its main component. This evaluation was performed during 19 weeks with 5 users (and 3 extra users during an iterative design phase) and, besides uncontrolled (but logged) daily usage, featured regular controlled experiments to observe the usersâ evolution (Figure 1). With these experiments we were able to collect data on mobile device performance usage, particularly text-entry, but also to observe how the improvements influenced the usersâ habits and interactions.
Tiago Guerreiro, Hugo Nicolau, Joaquim Jorge, Daniel Gonçalves
ASSETS 2009 â In The 11st International ACM SIGACCESS Conference on Computers and Accessibility. Pittsburgh, USA, October, 2009.
Social gaming: A systematic review
This work contributes with a systematized view of social aspects that permeate gaming experiences, while outlining directions and implications for future work. It presents a systematic review, covering 263 publications, with a particular focus on previous definitions and approaches, determinants that shape the experience, methodologies, and measurable outcomes.
David Gonçalves, Pedro Pais, Kathrin Gerling, Tiago Guerreiro, André Rodrigues
CHB 2023 â Computers in Human Behavior, July, 2023