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

By Kun Guo, Robert G. Robertson, Sasan Mahmoodi and Malcolm P. Young

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

Topics: C800 Psychology, C830 Experimental Psychology
Publisher: Wiley-Blackwell
Year: 2005
DOI identifier: 10.1111/j.1460-9568.2005.03858.x
OAI identifier: oai:eprints.lincoln.ac.uk:718
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