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J Neurophysiol (April 20, 2005). doi:10.1152/jn.00203.2005
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Submitted on February 25, 2005
Accepted on April 13, 2005

Cross-orientation suppression: monoptic and dichoptic mechanisms are different

Baowang Li1, Matthew R. Peterson1, Jeffrey K. Thompson1, Thang Duong1, and Ralph D. Freeman1*

1 Vision Science, UC Berkeley, Berkeley, CA, USA

* To whom correspondence should be addressed. E-mail: freeman{at}neurovision.berkeley.edu.

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 suggests 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 find 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 (Freeman et al., 2002). These results suggest that monoptic COS is mediated by subcortical mechanisms, whereas intracortical inhibition is the mechanism for dichoptic COS.




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