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Visual, tangible, and touch-screen: Comparison of platforms for displaying simple graphics
Pnina Gershon1, Roberta L Klatzky1, Hari Palani2
1a Department of Psychology , Carnegie Mellon University , Pittsburgh , Pennsylvania , USA.
Assistive Technology : the Official Journal of RESNA
|March 9, 2016
Summary
This study compared visual, tangible, and touch-screen displays for angle perception. Touch-screens showed promise for blind users but faced challenges with friction signals, impacting exploration time and accuracy.
Area of Science:
- Human-Computer Interaction
- Haptics and Tactile Displays
- Assistive Technology for the Blind
Background:
- Traditional interfaces often lack tactile feedback for spatial information.
- Advancements in refreshable graphical displays offer potential for enhanced interaction for visually impaired users.
- Understanding the efficacy of different sensory modalities is crucial for designing accessible interfaces.
Purpose of the Study:
- To compare the performance of visual, tangible, and touch-screen (friction and vibration) displays for exploring angular stimuli.
- To evaluate accuracy and exploration time across different platforms.
- To identify challenges and opportunities for using touch-screen technology with blind users.
Main Methods:
- Participants explored angular stimuli presented via four platforms: visual, tangible (sandpaper), touch-screen with friction, and touch-screen with vibration.
- Angle judgments were recorded.
- Exploration time was measured for each platform.
Main Results:
- All platforms yielded highly accurate angle judgments.
- Visual exploration was fastest, followed by tangible, vibration, and friction displays.
- Touch-screen displays, particularly friction, introduced more noise in perceived angular value compared to tangible displays.
- Friction display performance was impacted by first-generation technology limitations.
Conclusions:
- Refreshable graphical displays show potential for blind users, but barriers exist.
- Touch-screen technology, especially with friction feedback, requires further development for optimal use by visually impaired individuals.
- Future research should focus on improving touch-screen fidelity and exploring multi-modal feedback for enhanced accessibility.
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