ABSTRACT
Applications for blind users often involve the mapping of information such as size (magnitude) from one sensory domain (vision) onto another (sound or touch). For example, visual perception of length can be estimated directly by touch, or encoded to pitch or even vibration. Applications for blind users will benefit from fundamental research into human perception of computer-generated substitutions for vision. In this paper we present the results of a haptics-only experiment with the PHANToM that measures human performance (time and accuracy) judging relative magnitude with computer generated haptic properties. Magnitude was represented by either physical length (displacement), or vibration varied by frequency or amplitude. Eleven blind and eleven blindfolded sighted individuals participated. Displacement tasks were 50% slower than vibration conditions for all participants. Accuracy for displacement and vibration varied by amplitude was equivalent. Vibration varied by frequency was significantly less accurate, although we are cautious about the reliability of those results. Blind participants took 50% longer with equivalent accuracy to sighted participants. Sightedness had no effect on performance regarding the type of display. No other interaction effects were found. These results suggest that vibration varied by amplitude provides a faster and equally accurate display of magnitude compared with the traditional displacement approach. Secondly, the same coding benefits equally well visually disabled and sighted individuals.
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Index Terms
- Haptic comparison of size (relative magnitude) in blind and sighted people
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