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Cross-orientation suppression: monoptic and dichoptic mechanisms are different.

Authors :
Baowang Li
Matthew R Peterson
Jeffrey K Thompson
Thang Duong
Ralph D Freeman
Source :
Journal of Neurophysiology. Aug2005, Vol. 94 Issue 2, p1645-1650. 6p.
Publication Year :
2005

Abstract

The response of a cell in the primary visual cortex to an optimally oriented grating is suppressed by a superimposed orthogonal grating. This cross-orientation suppression (COS) is exhibited when the orthogonal and optimal stimuli are presented to the same eye (monoptically) or to different eyes (dichoptically). A recent study suggested that monoptic COS arises from subcortical processes; however, the mechanisms underlying dichoptic COS were not addressed. We have compared the temporal frequency tuning and stimulus adaptation properties of monoptic and dichoptic COS. We found that dichoptic COS is best elicited with lower temporal frequencies and is substantially reduced after prolonged adaptation to a mask grating. In contrast, monoptic COS is more pronounced with mask gratings at much higher temporal frequencies and is less prone to stimulus adaptation. These results suggest that monoptic COS is mediated by subcortical mechanisms, whereas intracortical inhibition is the mechanism for dichoptic COS. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00223077
Volume :
94
Issue :
2
Database :
Academic Search Index
Journal :
Journal of Neurophysiology
Publication Type :
Academic Journal
Accession number :
21128205
Full Text :
https://doi.org/10.1152/jn.00203.2005