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Contextual Effects by Short Range Connections in a Mean-Field Model of V1
Citation key Bartsch2001b
Author Bartsch, H. and Stetter, M. and Obermayer, K.
Pages 475 – 482
Year 2001
DOI 10.1016/S0925-2312(01)00366-6
Journal Neurocomputing
Volume 38-40
Publisher Elsevier
Abstract 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.
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