論文

査読有り
2000年

Magnetic response of human extrastriate cortex in the detection of coherent and incoherent motion

NEUROSCIENCE
  • K Lam
  • ,
  • Y Kaneoke
  • ,
  • A Gunji
  • ,
  • H Yamasaki
  • ,
  • E Matsumoto
  • ,
  • T Naito
  • ,
  • R Kakigi

97
1
開始ページ
1
終了ページ
10
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/S0306-4522(00)00037-3
出版者・発行元
PERGAMON-ELSEVIER SCIENCE LTD

Although direction selectivity is a cardinal property of neurons in the visual motion detection system, movement of numerous elements without global direction (incoherent motion) has been shown to activate human and monkey visual systems, as does coherent motion which has global direction. We used magnetoencephalography to investigate the neural process underlying responses to these types of motions in the human extrastriate cortex. Both motions were created using a random dot kinematogram and four speeds (0, 0.6, 9.6 and 25 degrees/s). The visual stimuli were composed of two successive motions at different speeds; a coherent motion at a certain speed that changed to incoherent motion at another speed or vice versa. Magnetic responses to the change in motion consisted of a few components, the first of which was always largest. The peak latency of the first component was inversely related to the speed of the preceding motion, but for both motions it was not affected by the speed of the subsequent motion. For each subject, the estimated origin of the first component was always in the extrastriate cortex, and this changed with the speed of the preceding motion. For both motions, the location for the slower preceding motion was lateral to that for the faster preceding motion. Although the latency changes of the two motions differed, their overall response properties were markedly similar.
These findings show that the speed of incoherent motion is represented in the human extrastriate cortex neurons to the same degree as coherent motion. We consider that the human visual system has a distinct neural mechanism to perceive random dots' motion even though they do not move in a specific direction as a whole. (C) 2000 IBRO. Published by Elsevier Science Ltd.

リンク情報
DOI
https://doi.org/10.1016/S0306-4522(00)00037-3
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/10771335
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000086751600001&DestApp=WOS_CPL
URL
http://www.sciencedirect.com/science/article/pii/S0306452200000373
ID情報
  • DOI : 10.1016/S0306-4522(00)00037-3
  • ISSN : 0306-4522
  • PubMed ID : 10771335
  • Web of Science ID : WOS:000086751600001

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