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On the development and functional roles of the horizontal connections within the primary visual cortex (V1)

Fulltext:


Authors:

Baran Çürüklü, Anders Lansner

Research group:

Robotics

Publication Type:

Report

Abstract

A laminar V1 model consisting of layers 4 and 2/3 is presented. The model is in line with the modular structure of the neocortex and addresses development of the horizontal connections within V1. Later, the functional roles of the horizontal connections are addressed. The neurons populating the layer 4 model exhibit sharp orientation selectivity despite poorly tuned LGN input. Sharp orientation selectivity is achieved through (i) control of the total activity of the modeled hypercolumns by normalization inhibition, and (ii) providing layer 4 units with information from a larger region than their classical receptive fields. This laminar V1 model addresses configuration-specific facilitation phenomena as well. Elongated layer 2/3 summation pools demonstrate that collinearly configured stimuli are easier to detect than orthogonally (or circularly) configured stimuli.

Bibtex

@techreport{Curuklu703,
author = {Baran {\c{C}}{\"u}r{\"u}kl{\"u} and Anders Lansner},
title = {On the development and functional roles of the horizontal connections within the primary visual cortex (V1)},
month = {March},
year = {2005},
url = {http://www.es.mdu.se/publications/703-}
}