Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users

Mobile devices are used in increasingly demanding contexts, which compete for the visual resources required for an effective interaction. This is more obvious when considering current visually demanding user interfaces. In this work, we propose using solutions initially designed for blind people in order to ease the visual demand of current mobile interfaces. A comparative user study was conducted with 23 sighted volunteers who performed text-entry tasks with three methods, QWERTY, VoiceOver alike and NavTouch in three mobility conditions. We first analyzed the effect of walking and visual demand, followed by the effect of using assistive technologies in mobile contexts. Results show that traditional QWERTY keyboard outperforms alternative textentry methods for the blind, as users prefer visual feedback over their auditory counterpart. Moreover assistive technologies and their interaction processes revealed to be cognitively demanding and therefore inadequate in mobile contexts. These findings suggest that technology transfer should be performed with caution, and adaptations must be done to account for differences in users’ capabilities.

[1]  Chris Schmandt,et al.  Nomadic radio: speech and audio interaction for contextual messaging in nomadic environments , 2000, TCHI.

[2]  Christopher D. Wickens,et al.  Multiple resources and performance prediction , 2002 .

[3]  Virpi Roto,et al.  Interaction in 4-second bursts: the fragmented nature of attentional resources in mobile HCI , 2005, CHI.

[4]  Yeliz Yesilada,et al.  A simple solution: solution migration from disabled to small device context , 2010, W4A.

[5]  Jukka Häkkinen,et al.  Examining mobile phone text legibility while walking , 2004, CHI EA '04.

[6]  Kumiko Tanaka-Ishii,et al.  Text Entry Systems: Mobility, Accessibility, Universality , 2007 .

[7]  Joaquim A. Jorge,et al.  From Tapping to Touching: Making Touch Screens Accessible to Blind Users , 2008, IEEE MultiMedia.

[8]  Andrew Sears,et al.  Physical disabilities and computing technologies: an analysis of impairments , 2002 .

[9]  David R. Morse,et al.  Using while moving: HCI issues in fieldwork environments , 2000, TCHI.

[10]  Steinar Kristoffersen,et al.  “Making place” to make IT work: empirical explorations of HCI for mobile CSCW , 1999, GROUP.

[11]  Enrico Rukzio,et al.  Investigating selection and reading performance on a mobile phone while walking , 2010, Mobile HCI.

[12]  Andrew Sears,et al.  How do people tap when walking? An empirical investigation of nomadic data entry , 2007, Int. J. Hum. Comput. Stud..

[13]  Grigori E. Evreinov,et al.  Adaptive blind interaction technique for touchscreens , 2006, Universal Access in the Information Society.

[14]  Stephen A. Brewster,et al.  A paradigm shift: alternative interaction techniques for use with mobile & wearable devices , 2003, CASCON.