Bernstein Center Freiburg

PhD Seminar

August 6, 2019
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Bernstein Seminar
MARCO TABARELLI ►

Bernstein Center Freiburg | University of Freiburg

A neuronal network model for the simultaneous encoding of color and orientation of a visual stimulus

Tuesday, August 6, 2019

17:45h

Hosted by Wenqing Wei

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Bernstein Center Freiburg
Lecture Hall (ground floor)
Hansastr. 9a
79104 Freiburg


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Abstract

It has been shown previously that contrast-invariant neuronal responses to oriented visual stimuli emerge in random network models of primary visual cortex, if two conditions are met: (1) Non-linear amplification of thalamo-cortical inputs to the primary visual cortex generates a small bias for certain stimulus orientations by random sampling from a circular receptive field that has no a priori orientation. (2) A selective attenuation mechanism effectively removes the non-informative input component and makes the tuning curves contrast-independent, provided that recurrent inhibition dominates excitation. In the present study, the same thalamo-cortical network architecture is extended to investigate input-output relations of network models for dichromatic and trichromatic color vision. We assume a spatial arrangement of several different types of sensors in the retina with specific spectral sensitivity curves. We then employ specifically designed chromatic gratings to study color sensitivity of neurons in the primary visual cortex. With the help of this model, we want to shed light on the network-level requirements for the emergence of trichromatic color vision in evolution.

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