Evidence for dissociation between the perceptual and visuomotor systems inhumans

Citation
N. Yamagishi et al., Evidence for dissociation between the perceptual and visuomotor systems inhumans, P ROY SOC B, 268(1470), 2001, pp. 973-977
Citations number
27
Categorie Soggetti
Experimental Biology
Journal title
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
ISSN journal
09628452 → ACNP
Volume
268
Issue
1470
Year of publication
2001
Pages
973 - 977
Database
ISI
SICI code
0962-8452(20010507)268:1470<973:EFDBTP>2.0.ZU;2-2
Abstract
When a visual stimulus is continuously moved behind a small stationary wind ow the window appears displaced in the direction of motion of the stimulus. In this study we showed that the magnitude of this illusion is dependent o n (i) whether a perceptual or visuomotor task is used for judging the locat ion of the window: (ii) the directional signature of the stimulus, and (iii ) whether or not there is a significant delay between the end of the visual presentation and the initiation of the localization measure. Our stimulus was a drifting sinusoidal grating windowed in space by a stationary, two-di mensional, Gaussian envelope (sigma =1 cycle of sinusoid). Localization mea sures were made following either a short (200 ms) or long (4.2 s) post-stim ulus delay The visuomotor localization error was up to three times greater than the perceptual error for a short delay However: the visuomotor and per ceptual localization measures were similar for a long delay Our results pro vide evidence in support of the hypothesis that separate cortical pathways exist for visual perception and visually guided action and that delayed act ions rely on stored perceptual information.