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Modelle neuronaler Systeme

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The Influence of Threshold Variability on the Response of Visual Cortical Neurons
Zitatschlüssel Bartsch2000
Autor Bartsch, H. and Stetter, M. and Obermayer, K.
Seiten 37 – 43
Jahr 2000
DOI 10.1016/S0925-2312(00)00141-7
Journal Neurocomputing
Jahrgang 32–32
Verlag Elsevier
Zusammenfassung Orientation–selective neurons in monkeys and cats show contrast saturation and contrast–invariant orientation tuning. Recently proposed models for orientation selectivity predict contrast invariant orientation tuning but no contrast saturation at high strength of intracortical recurrent couplings, whereas at lower coupling strengths the contrast response saturates but the tuning widths are contrast dependent. In the present work we address the question, if and under which conditions the incorporation of a stochastic distribution of activation thresholds for cortical neurons helps resolving that paradoxon. We find that both phenomena occurs naturally if two different classes of inhibitory inter-neurons are combined. Low threshold inhibition keeps the gain of the cortical amplification finite, whereas high threshold inhibition causes contrast saturation.
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