論文

査読有り
2006年3月

Contrast-dependent, contextual response modulation in primary visual cortex and lateral geniculate nucleus of the cat

EUROPEAN JOURNAL OF NEUROSCIENCE
  • O Sadakane
  • ,
  • H Ozeki
  • ,
  • T Naito
  • ,
  • T Akasaki
  • ,
  • T Kasamatsu
  • ,
  • H Sato

23
6
開始ページ
1633
終了ページ
1642
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1111/j.1460-9568.2006.04681.x
出版者・発行元
BLACKWELL PUBLISHING

In the primary visual cortex (V1), the responses of neurons to stimuli presented in their classical receptive fields (CRFs) are modulated by another stimulus concurrently presented in their surround (receptive field surround, SRF). We studied the nature of the modulatory effects of SRF stimulation with respect to stimulus contrast in cat V1. In 51 V1 neurons studied, large SRF stimuli (40 degrees x 30 degrees) induced only the suppression of responses to CRF stimulation and the suppressive effects became stronger as the contrast for SRF stimulation increased. The contrast sensitivity of SRF suppression did not correlate with that of CRF responses. By independently controlling contrast of CRF and SRF stimuli, we studied whether SRF effects vary with CRF response magnitude. Increasing contrast for CRF stimulation caused an upward shift of the range of effective contrasts for SRF stimulation, indicating that a high contrast for SRF stimulation is required for suppressing strong responses to CRF stimulation at high contrasts. To assess the possible origin of the suppressive SRF effect on V1 neurons, we also investigated the contrast dependency of SRF effects in 28 neurons from the lateral geniculate nucleus. Our results suggest that SRF effects obtained at the subcortical level strongly contribute to those in V1. Taken together, we conclude that along the thalamocortical projections, SRF modulation exhibits a gain-control mechanism that scales the suppressive SRF effect depending on the contrast for CRF stimulation. In addition, SRF effects can be facilitatory at low stimulus contrasts potentially due to the enlargement of the summation field.

Web of Science ® 被引用回数 : 29

リンク情報
DOI
https://doi.org/10.1111/j.1460-9568.2006.04681.x
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/16553627
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000236176000024&DestApp=WOS_CPL
ID情報
  • DOI : 10.1111/j.1460-9568.2006.04681.x
  • ISSN : 0953-816X
  • PubMed ID : 16553627
  • Web of Science ID : WOS:000236176000024

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