A Model of Temporal Coding of Stimulus Orientation by Neuronal Responses in Primary Visual Cortex
It has been shown experimentally that stimulus orientation that elicits the optimal response in an orientation column in the primary visual га^х (area V1) undergoes quick systematic changes occurring during 10-100 ms. These changes allow different orientation columns to encode information from multiple items in visual space (so called temporal encoding). However, the mechanism responsible for these changes is still unknown. Besides, most of modern biophysical models are unable to reproduce these changes; peak orientation of their responses is permanent during the time course. In this paper, we suggested to improve firing-rate ring model of the orientation hypercolumn by replacing: spatial symmetric distribution of local connections with spatial asymmetric distribution. As a result, we have more perfect model able to reproduce such changes. Moreover, their amplitude is proportional to extent of asymmetry in spatial distribution of local connections.