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1 Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA; Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, USA
2 Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
3 Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, USA; Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
* To whom correspondence should be addressed. E-mail: samondjm{at}cnbc.cmu.edu.
We explored how contour information in primary visual cortex might be embedded in the simultaneous activity of multiple cells recorded with a 100-electrode array. Synchronous activity in cat visual cortex was more selective and predictable in discriminating between drifting grating and concentric ring stimuli than changes in firing rate. Synchrony was found even between cells with wholly different orientation preferences when their receptive fields were circularly aligned, and membership in synchronous groups was orientation- and curvature-dependent. The existence of synchrony between cocircular cells reinforces its role as a general mechanism for contour integration and shape detection, as predicted by association field concepts. Our data suggest that cortical synchrony results from common and synchronous input from earlier visual areas and that it could serve to shape extrastriate response selectivity.
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