Contextual effects by short range connections in a mean-field model of V1

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• 作者：Bartsch ; Hauke ; Stetter ; Martin ; Obermayer ; Klaus
• 关键词：Primary visual cortex ; Contextual effects ; Short-range connections
• 刊名：Neurocomputing
• 出版年：2001
• 出版时间：June, 2001
• 年：2001
• 卷：38-40
• 期：Complete
• 页码：475-481
• 全文大小：191 K

文摘

In this paper, we derive a model for analyzing the influence of local cortical connections on the activities of neurons in V1. A set of orientation columns is arranged according to a measured orientation map. Orientation columns are connected by local excitatory and slightly more distributed inhibitory fibers. Based on this geometrical model we demonstrate that (i) sharp and contrast–invariant orientation tuning curves are combined with contrast saturation, (ii) the strength of cortical amplification can be localized in orientation space and (iii) anisotropic contextual suppression by iso-oriented flanking stimuli arises as an emergent property and can be mediated by local connections.