Network model of top-down influences on local gain and contextual interactions in visual cortex
Open Access
- 7 October 2013
- journal article
- Published by National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 110 (43) , E4108-E4117
Abstract
Significance: Perceptual grouping links line segments that define object contours and distinguishes them from background contours. This process is reflected in the responses to contours of neurons in primary visual cortex (V1), and depends on long-range horizontal cortical connections. We present a network model, based on an interaction between recurrent inputs to V1 and intrinsic connections within V1, which accounts for task-dependent changes in the properties of V1 neurons. The model simulates top-down modulation of effective connectivity of intrinsic cortical connections among biophysically realistic neurons. It quantitatively reproduces the magnitude and time course of the facilitation of V1 neuronal responses to contours.Keywords
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