Assessing mobile touch interfaces for tetraplegics

Guerreiro, Tiago; Nicolau, Hugo; Jorge, Joaquim; Gonçalves, Daniel

doi:10.1145/1851600.1851608

Cited by 26 publications

(32 citation statements)

References 7 publications

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“…This functional evaluation aimed to produce a more objective capability identification in opposition to lesion level. However, no correlations between participants' characteristics and task performance were found [4]. Regarding technologic experience, all participants had a mobile phone and used it on a daily basis.…”

Section: Participantsmentioning

confidence: 93%

“…When asked about the techniques' Ease of Use (using a 5-point Likert scale), the median [quartiles] attributed by the users was for Exiting 2 [2,3], for Tapping 4 [4, 4.5], for Crossing 4 [4,4] and for Directional Gesturing 4 [4,4], showing a slight preference for Tapping. This idea was reinforced when the users were asked about their preferred method (9/15 selected Tapping, 3/15 selected Crossing, and 3/15 selected Directional Gesturing).…”

Section: User Opinionsmentioning

confidence: 99%

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Towards accessible touch interfaces

Guerreiro

Nicolau

Jorge

et al. 2010

Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility

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Touch screen mobile devices bear the promise of endless leisure, communication, and productivity opportunities to motor-impaired people. Indeed, users with residual capacities in their upper extremities could benefit immensely from a device with no demands regarding strength. However, the precision required to effectively select a target without physical cues creates problems to people with limited motor abilities. Our goal is to thoroughly study mobile touch screen interfaces, their characteristics and parameterizations, thus providing the tools for informed interface design for motor-impaired users. We present an evaluation performed with 15 tetraplegic people that allowed us to understand the factors limiting user performance within a comprehensive set of interaction techniques (Tapping, Crossing, Exiting and Directional Gesturing) and parameterizations (Position, Size and Direction). Our results show that for each technique, accuracy and precision vary across different areas of the screen and directions, in a way that is directly dependent on target size. Overall, Tapping was both the preferred technique and among the most effective. This proves that it is possible to design inclusive unified interfaces for motor-impaired and able-bodied users once the correct parameterization or adaptability is assured.

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Section: Participantsmentioning

confidence: 93%

Section: User Opinionsmentioning

confidence: 99%

Towards accessible touch interfaces

Guerreiro

Nicolau

Jorge

et al. 2010

Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility

Self Cite

View full text Add to dashboard Cite

show abstract

“…Touchscreen input also offers the advantage that it requires less strength to use compared to physical buttons [12]. At the same time, many basic touchscreen interactions have proven difficult or in some cases impossible [1,3,9,10,14,16,24,25] For instance, Guerreiro et al [13] measured the accuracy of tapping, crossing, exiting and directional gesturing operations with users with tetraplegia, finding that targets located at the bottom of the screen and next to the preferred hand were the easiest to select. As for multi-touch gestures, Trewin et al [24] found that users with motor impairments encountered difficulties in pinching and performing three-finger slides (confirming [1]).…”

Section: Accessibility Of Touchscreen Inputmentioning

confidence: 99%

“…Request permissions from Permissions@acm.org. with quadriplegia (12mm) [13], and the utility of sliding rather than tapping to reduce input errors for users with tremor [25].…”

Section: Introductionmentioning

confidence: 99%

Accessibility in context

Naftali

Findlater

2014

Proceedings of the 16th International ACM SIGACCESS Conference on Computers &Amp; Accessibility - ASSETS '14

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Lab-based studies on touchscreen use by people with motor impairments have identified both positive and negative impacts on accessibility. Little work, however, has moved beyond the lab to investigate the truly mobile experiences of users with motor impairments. We conducted two studies to investigate how smartphones are being used on a daily basis, what activities they enable, and what contextual challenges users are encountering. The first study was a small online survey with 16 respondents. The second study was much more in depth, including an initial interview, two weeks of diary entries, and a 3-hour contextual session that included neighborhood activities. Four expert smartphone users participated in the second study and we used a case study approach for analysis. Our findings highlight the ways in which smartphones are enabling everyday activities for people with motor impairments, particularly in overcoming physical accessibility challenges in the real world and supporting writing and reading. We also identified important situational impairments, such as the inability to retrieve the phone while in transit, and confirmed many lab-based findings in the real-world setting. We present design implications and directions for future work.

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“…The difficulties may be so serious that users refrain from us ing touch devices such as smart phones and tablets. Prior studies in both controlled and real-world settings have con firmed that even the simplest task, single tapping, can require significant effort and time for these users [6,11]. These stud ies have shown that users with motor impairments tend to make more mistakes when selecting their touch targets than users without impairments.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Android accessibility for users with hand tremor by reducing fine pointing and steady tapping

Zhong

Weber

Burkhardt

et al. 2015

Proceedings of the 12th International Web for All Conference

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Smartphones and tablets with touchscreen have demonstrated potential to support the needs of individuals with motor im pairments such as hand tremor. However, those users still face major challenges with conventional touchscreen ges tures. These challenges are mostly caused by the fine pre cision requirement to disambiguate between targets on small screens. To reduce the difficulty caused by hand tremor in combination with small touch targets on the screen, we de veloped an experimental system-wide assistive service called Touch Guard. It enables enhanced area touch and a series of complementary features. This service provides the en hanced area touch feature through two possible disambigua tion modes: magnification and descriptive targets list. In a laboratory study with motor-impaired users, we compared both modes to conventional tapping and tested Touch Guard with real-world applications. Targets list based disambigua tion was more successful, reducing the error rate by 65% compared to conventional tapping. In addition, several chal lenges and design implications were discovered when pre senting new touchscreen interaction techniques to users with motor impairments. As the experimental product of an intern research project at Google, Touch Guard demonstrates broad potential for solving accessibility issues for people with hand tremor using their familiar mobile devices, instead of highcost hardware.

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Assessing mobile touch interfaces for tetraplegics

Cited by 26 publications

References 7 publications

Towards accessible touch interfaces

Towards accessible touch interfaces

Accessibility in context

Enhancing Android accessibility for users with hand tremor by reducing fine pointing and steady tapping

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