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Cerebral Cortex Advance Access originally published online on December 22, 2005
Cerebral Cortex 2006 16(11):1531-1545; doi:10.1093/cercor/bhj090
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Extraclassical Receptive Field Phenomena and Short-Range Connectivity in V1

Jim Wielaard and Paul Sajda

Laboratory for Intelligent Imaging and Neural Computing, Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA

Address correspondence to Jim Wielaard or Paul Sajda, Laboratory for Intelligent Imaging and Neural Computing, Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA. Email addresses: djw21{at}columbia.edu (Jim Wielaard), ps629{at}columbia.edu (Paul Sajda).

Extraclassical receptive field phenomena in V1 are commonly attributed to long-range lateral connections and/or extrastriate feedback. We address 2 such phenomena: surround suppression and receptive field expansion at low contrast. We present rigorous computational support for the hypothesis that the phenomena largely result from local short-range (<0.5 mm) cortical connections and lateral geniculate nucleus input. The neural mechanisms of surround suppression in our simulations operate via (A) enhancement of inhibition, (B) reduction of excitation, or (C) action of both simultaneously. Mechanisms (B) and (C) are substantially more prevalent than (A). We observe, on average, a growth in the spatial summation extent of excitatory and inhibitory synaptic inputs for low-contrast stimuli. However, we find this is neither sufficient nor necessary to explain receptive field expansion at low contrast, which usually involves additional changes in the relative gain of these inputs.

Key Words: model • receptive field • simulation • spatial summation • surround suppression • visual cortex


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Home page
 J. Neurophysiol.Home page
J. Wielaard and P. Sajda
Dependence of Response Properties on Sparse Connectivity in a Spiking Neuron Model of the Lateral Geniculate Nucleus
J Neurophysiol, December 1, 2007; 98(6): 3292 - 3308.
[Abstract] [Full Text] [PDF]


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