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J Neurophysiol (June 9, 2004). doi:10.1152/jn.00281.2004
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Submitted on March 22, 2004
Accepted on June 2, 2004

The influence of lateral connections on the structureof cortical maps

Geoffrey J. Goodhill1* and Miguel A. Carreira-Perpinan1

1 Neuroscience, Georgetown University Medical Center, Washington, DC, USA

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

Maps of ocular dominance and orientation in primary visual cortex have a highly characteristic structure. The factors that determine this structure are still largely unknown. In particular, it is unclear how the function of short-range excitatory and inhibitory connections between nearby neurons influences structure both within and between maps. Using a generalized version of a well-known computational model of visual cortical map development, we show that the number of excitatory and inhibitory oscillations in this function critically influences map structure. Specifically, we demonstrate that functions that oscillate more than once do not produce maps closely resembling those seen biologically. This strongly suggests that local lateral connections in visual cortex oscillate only once and have the form of a Mexican hat.




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