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Title: Touch Screen Performance as a Function of the Duration of Auditory Feedback and Target Size
Year: 1999
Institution: Wichita State University
Abstract: Touch screens are commonly used in the retail industry as a replacement for mechanical key based devices. However, data entry speed and error rates are often worse with touch screens than with mechanical key based devices, possibly due to the decreased proprioceptic feedback provided by touch screens. An appropriate auditory feedback signal may help compensate for the reduced proprioceptic feedback and increase touch screen performance. Three studies were conducted to empirically evaluate the effect of the duration of auditory feedback (12.5, 25, 50, 100, 200, 400, & 800 ms) and target size (10 mm × 10 mm & 30 mm × 30 mm) on touch screen ten-key entry movement time, contact time, and errors. Results indicate that (a) performance is better with large targets than small targets, and (b) error rates with small targets are reduced if auditory feedback between 50 and 400 ms is provided. Design recommendations for touch screen point of sale interfaces are discussed.
Download: dissertation.pdf [256 KB]
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