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Functional organization of the primary visual cortex Hiromichi Sato 1 1School of Health and Sport Sciences and Graduate School of Frontier Biosciences, Osaka University Keyword: 一次視覚野 , 機能コラム , 特徴抽出性 , 刺激文脈依存的反応修飾 pp.159-166
Published Date 2004/4/10
DOI https://doi.org/10.11477/mf.1431100189
  • Abstract
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 I summarized current understandings of the functional organization of the primary visual cortex(V1). There are three functionally distinct pathways from lateral geniculate nucleus(LGN)to V1,that is, magnocellular, parvocellular and koniocellular projections. In V1, the processing in feedforward pathway, that is, layer 4-layers 2/3-prestriate area, is modulated by recurrent connections within each layer and feedback pathway from deep layers. Functional columns, such as ocular dominance-, orientation-, spatial frequency-column and blob,are arranged throughout V1 to cover all visual field. Stimulus-specific response property is produced in collaboration of afferent inputs with a bias to a particular stimulus feature and excitatory/inhibitory interaction within V1. Cortico-thalamic feedback from layer 6 binocularly controls LGN neurons probably to enhance outputs on the particular location in the visual field with a stimulus-biased manner. To understand the integration of thalamo-corrtical, intracortical, cortico-thalamic and topdown mechanisms for optimizing visual information processing in V1, the contextual modulation of response, that is, the modulation of visual response to the stimulation of receptive field by the stimulation of outside the receptive field, is one of the key phenomena to be addressed.

(Received:December 16, 2003)


Copyright © 2004, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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