The tolerance for visual feedback distortions in a virtual environment

We are interested in using a virtual environment with a robotic device to extend the strength and mobility of people recovering from strokes by steering them beyond what they had thought they were capable of doing. Previously, we identified just noticeable differences (JND) of a finger's force...

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Bibliographic Details
Published in:Physiology & behavior 2002-12, Vol.77 (4), p.651-655
Main Authors: Matsuoka, Yoky, Allin, Sonya J., Klatzky, Roberta L.
Format: Article
Language:English
Subjects:
Adult
Computer Graphics
Feedback - physiology
Feedback distortion
Female
Fingers - innervation
Fingers - physiology
Humans
Just noticeable difference
Male
Proprioception - physiology
Robotic rehabilitation
Robotics
Space Perception - physiology
Stroke Rehabilitation
Touch - physiology
Virtual environment
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Summary:We are interested in using a virtual environment with a robotic device to extend the strength and mobility of people recovering from strokes by steering them beyond what they had thought they were capable of doing. Previously, we identified just noticeable differences (JND) of a finger's force production and position displacement in a virtual environment. In this paper, we extend this investigation by identifying peoples' tolerance for distortions of visual representations of force production and positional displacement in a virtual environment. We determined that subjects are not capable of reliably detecting inaccuracies in visual representation until there is 36% distortion. This discrepancy between actual and perceived movements is significantly larger than the JNDs reported in the past, indicating that a virtual robotic environment could be a valuable tool for steering actual movements further away from perceived movements. We believe this distorted condition may allow people recovering from strokes, even those who have perceptual or cognitive deficits, to rehabilitate with greater ease.
ISSN:0031-9384
1873-507X
DOI:10.1016/S0031-9384(02)00914-9