An architectural hypothesis for direction selectivity in the visual cortex: the role of spatially asymmetric intracortical inhibition |
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Authors: | Silvio P Sabatini Fabio Solari |
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Institution: | (1) Department of Biophysical and Electronic Engineering, University of Genoa, Via all'Opera Pia 11/A, I-16145 Genoa, Italy, IT |
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Abstract: | Within a linear field approach, an architectural model for simple cell direction selectivity in the visual cortex is proposed.
The origin of direction selectivity is related to recurrent intracortical interactions with a spatially asymmetric character
along the axis of stimulus motion. No explicit asymmetric temporal mechanisms are introduced or adopted. The analytical investigation
of network behavior, carried out under the assumption of a linear superposition of geniculate and intracortical contributions,
shows that motion sensitivity of the resulting receptive fields emerges as a dynamic property of the cortical network without
any feed-forward direction selectivity bias. A detailed analysis of the effects of the architectural characteristics of the
cortical network on directionality and velocity-response curves was conducted by systematically varying the model's parameters.
Received: 8 May 1998 / Accepted in revised form: 10 November 1998 |
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