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Centre-surround interactions in response to natural scene stimulation in the primary visual cortex

Lookup NU author(s): Dr Robert Robertson, Dr Sasan Mahmoodi, Professor Malcolm Young

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Abstract

Centre-surround interaction in the primary visual cortex (area V1) has been studied extensively using artificial, abstract stimulus patterns, such as bars, gratings and simple texture patterns. In this experiment, we extend the study of centre-surround interaction by using natural scene images. We systematically varied the contrast of natural image surrounds presented outside the classical receptive field (CRF), and recorded neuronal response to a natural image patch presented within the CRF in area V1 of awake, fixating macaques. For the majority of neurons (67 out of 111), the natural image surrounds profoundly modulated, mainly by suppressing, neuronal responses to CRF images. These modulatory effects started at the earliest stage of neuronal responses, and often depended on the contrast and higher-order structures of the surrounds. For 47 out of 67 neurons, randomising the phases of the Fourier spectrum of the natural image surround diminished the centre-surround interaction. Our results suggest that the centre-surround interaction in area V1 can be extended to natural vision, and is sensitive to the higher-order structures of natural scene images, such as image contours.


Publication metadata

Author(s): Guo K, Robertson RG, Mahmoodi S, Young MP

Publication type: Article

Publication status: Published

Journal: European Journal of Neuroscience

Year: 2005

Volume: 21

Issue: 2

Pages: 536-548

Print publication date: 01/01/2005

ISSN (print): 0953-816X

ISSN (electronic): 1460-9568

Publisher: Wiley

URL: http://dx.doi.org/10.1111/j.1460-9568.2005.03858.x

DOI: 10.1111/j.1460-9568.2005.03858.x

PubMed id: 15673453


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