Premium
Inhibitory Interhemispheric Visuovisual Interaction in Motion Perception
Author(s) -
BRANDT THOMAS,
MARX ESTHER,
STEPHAN THOMAS,
BENSE SANDRA,
DIETERICH MARIANNE
Publication year - 2003
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1303.025
Subject(s) - inhibitory postsynaptic potential , perception , motion perception , psychology , neuroscience , motion (physics) , communication , audiology , cognitive psychology , computer science , medicine , artificial intelligence
Findings of an earlier functional magnetic resonance imaging (fMRI) study that coherent motion stimulation of the right or left visual hemifield exhibited negative signal changes (deactivations) in the primary visual cortex and the lateral geniculate nucleus contralateral to the stimulated hemisphere were evaluated to determine the functional significance of this contralateral inhibition of the visual system. Fourteen subjects participated in a psychophysical study on the perception of single object motion (0.4°/s) in one visual hemifield with or without concurrent coherent motion stimulation of the contralateral hemifield. Mean detection times for horizontal object motion (0.5 ± 0.19 vs. 0.61 ± 0.22 s) and vertical object motion (0.53 ± 0.19 vs. 0.72 ± 0.34 s) were significantly prolonged during concurrent motion pattern stimulation in the contralateral hemifield. These data support the interpretation that the deactivation of neuronal activity in the visual system found by fMRI is associated with a functional decrement in the sensitivity needed to perceive motion and may reflect transcallosal attentional shifts between the two hemispheres.