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About the Innuence of Neuronal Variability in a Mean{field Model of the Visual Cortex 0 1 2 3 4 5 0 50 0 1 2 3 4 5 0 2 0 1 2 3 4 5 0 2
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stetter, Martin Dept, Klaus Obermayer |
| Copyright Year | 2007 |
| Abstract | Model of the Visual Cortex Hauke Bartsch, Martin Stetter and Klaus Obermayer Dept. of Computer Science, Technische Universit at Berlin, Germany, E-mail: hauke@cs.tu-berlin.de Orientation{selective neurons in monkeys and cats show contrast saturation and contrast{invariant orientation tuning. Recently, several studies for the emergence of these phenomena from cortical circuity have been carried out [2,1] which were based on a mean{ eld description of the activities of neuron populations. For each orientation column , all excitatory (e) and all inhibitory (i) neurons were described collectively by their mean activations me( ; t) and mi( ; t). Their time evolution was guided by a erent and intracortical input fed through thresholded semilinear activation functions ge;i, with threshold and gain of the inhibitory cells being higher than that of the excitatory cells. These models predict contrast invariant orientation tuning but no contrast saturation at high coupling strengths (top gure), whereas at lower coupling strengths the contrast response saturats but the tuning widths are contrast dependent [3,1]. In the present work we address the 0 1 2 3 4 5 0 50 |
| File Format | PDF HTM / HTML |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
