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- H. Bartsch, M. Stetter, and
K. Obermayer. Contextual Effects by Short Range Connections in a
Mean-Field Model of V1.
.
Neurocomputing, 38-40:475-482, 2001.
(FTP Gzipped PostScript, 6 pages, 114 kb)
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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