Central Visual Persistences: I. Visual and Kinesthetic Interactions

Phenomena associated with ‘central visual persistences’ (CPs) are new to both medical and psychological literature. Five subjects have reported similar CPs: positive afterimages following brief fixation of high-contrast objects or drawings and eye closure. CPs duplicate shapes and colors of single o...

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Bibliographic Details
Published in:Perception (London) 2005-01, Vol.34 (9), p.1135-1151
Main Author: Ingle, David
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Color Perception - physiology
Contrast Sensitivity - physiology
Female
Figural Aftereffect - physiology
Fixation, Ocular
Fundamental and applied biological sciences. Psychology
Hand
Humans
Kinesthesis - physiology
Male
Middle Aged
Movement - physiology
Neuropsychological Tests
Perception
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychomotor Performance
Psychophysics
Vision
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Summary:Phenomena associated with ‘central visual persistences’ (CPs) are new to both medical and psychological literature. Five subjects have reported similar CPs: positive afterimages following brief fixation of high-contrast objects or drawings and eye closure. CPs duplicate shapes and colors of single objects, lasting for about 15 s. Unlike retinal afterimages, CPs do not move with the eyes but are stable in extrapersonal space during head or body rotations. CPs may reflect sustained neural activity in neurons of association cortex, which mediate object perception. A remarkable finding is that CPs can be moved in any direction by the (unseen) hand holding the original seen object. Moreover, a CP once formed will ‘jump’ into an extended hand and ‘stick’ in that hand as it moves about. The apparent size of a CP of a single object is determined by the size of the gap between finger and thumb, even when no object is touched. These CPs can be either magnified or minified via the grip of the extended hand. The felt orientation of the hand-held object will also determine the orientation of the CP seen in that hand. Thus, kinesthetic signals from hand and arm movements can determine perceived location, size, and orientation of CPs. A neural model based on physiological studies of premotor, temporal, parietal, and prefrontal cortices is proposed to account for these novel phenomena.
ISSN:0301-0066
1468-4233
DOI:10.1068/p5408