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J Neurophysiol (September 15, 2004). doi:10.1152/jn.00668.2004
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Submitted on July 2, 2004
Accepted on September 8, 2004

Spatial overlap of "on" and "off" subregions and its relation to response modulation ratio in macaque primary visual cortex

Mario L. Mata1 and Dario L. Ringach2*

1 Neurobiology, UCLA, Los Angeles, CA, USA
2 Neurobiology, UCLA, Los Angeles, CA, USA; Psychology, UCLA, Los Angeles, CA, USA; Jules Stein Eye Institute, UCLA, Los Angeles, CA, USA

* To whom correspondence should be addressed. E-mail: dario{at}ucla.edu.

We studied the spatial overlap of "on" and "off" subregions in macaque primary visual cortex and its relation to the response modulation ratio (the F1/F0 ratio). Spatial maps of "on" and "off" subregions were obtained by reverse correlation with a dynamic noise pattern of bright and dark spots. Two spatial maps, "on" and "off", were produced by cross-correlating the spike train with the location of bright and dark spots in the stimulus respectively. Several measures were used to assess the degree of overlap between subregions. In a subset of neurons, we also computed the F1/F0 ratio in response to drifting sinusoidal gratings. Significant correlations were found among all the overlap measures and the F1/F0 ratio. Most overlap indices considered, and the F1/F0 measure, had bimodal distributions or showed trends towards bimodality. In contrast, the distance between "on" and "off" subregions normalized by their size was unimodal. Surprisingly, a simple model that additively combines "on" and "off" subregions with spatial separations drawn from a unimodal distribution, can readily explain the data. These analyses clarify the relationship between subregion overlap and the F1/F0 ratio in macaque primary visual cortex, and a simple model provides a parsimonious explanation for the co-existence of bimodal distributions of overlap indices and a unimodal distribution of the normalized distance between subregions.




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