Distortions in definite distance and shape perception as measured by reaching without and with haptic feedback

Psychophysical studies reveal distortions in perception of distance and shape. Are reaches calibrated to eliminate distortions? Participants reached to the front, side, or back of a target sphere. In Experiment 1, feedforward reaches yielded distortion and outward drift. In Experiment 2, haptic feed...

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Bibliographic Details
Published inJournal of experimental psychology. Human perception and performance Vol. 26; no. 4; p. 1436
Main Authors Bingham, G P, Zaal, F, Robin, D, Shull, J A
Format Journal Article
LanguageEnglish
Published United States 01.08.2000
Subjects
Adult
Biofeedback, Psychology
Distance Perception
Female
Form Perception
Humans
Illusions
Male
Movement
Vision Disparity
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Summary:Psychophysical studies reveal distortions in perception of distance and shape. Are reaches calibrated to eliminate distortions? Participants reached to the front, side, or back of a target sphere. In Experiment 1, feedforward reaches yielded distortion and outward drift. In Experiment 2, haptic feedback corrected distortions and instability. In Experiment 3, feedforward reaches with only haptic experience of targets replicated the shape distortions but drifted inward. This showed that outward drift in Experiment 1 was visually driven. In Experiment 4, visually guided reaches were accurate when participants used binocular vision but when they used monocular vision, reaches were distorted. Haptic feedback corrected inaccuracy and instability of distance but did not correct monocular shape distortions. Dynamic binocular vision is representative and accurate and merits further study.
ISSN:0096-1523
1939-1277
DOI:10.1037/0096-1523.26.4.1436