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Area MST and motion vision Hideo Sakata 1,2 1Department of Physiology, Nihon University School of Medicine 2Department of Physiology, Seitoku Junior College of Nutrition Keyword: 視覚的追跡ニューロン , 奥行運動感受性ニューロン , 回転感受性ニューロン , オプティックフロー , 自己運動 pp.567-582
Published Date 2004/8/10
DOI https://doi.org/10.11477/mf.1431100212
  • Abstract
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 MST(medial superior temporal)area in macaques was defined anatomically by the forward corticocortical projection from neighboring V5/MT area. Most of MST neurons were directionally selective. Their visual receptive fields were larger than those of V5/MT neurons and were not retinotopically organized. One of the featuring cells in MST are the visual tracking(pursuit)neurons that receive retinal signals of moving background and the extraretinal signals of eye movement. It was concluded that visual tracking(VT)neurons encode the direction and velocity of the visual target of pursuit. Extraretinal signal of eye movement have inhibitory effect on the MST neurons activated by movement of external object to suppress their responses to self-induced movement of retinal image to be discriminated from real movement. The depth-movement-sensitive neurons in MST encode the direction of movement of object in three-dimensional space by combining the signals of size change and disparity change of the retinal image. Sakata et al(1985)discovered the rotation-sensitive neurons in MST. They respond selectively to the rotary movement of the visual stimulus in contrast to the linear movement. Many of the rotation-sensitive cells preferred rotation in depth, in horizontal sagittal and diagonal planes. They responded to the rotary movement of a single spot suggesting to compute rotary movement from the change of direction. Many of the visual neurons in MSTd responded to the optic flow of planar, circular and radial patterns. Many of them responded to the combination of circular and planar optic flow and were selective in FOE(focus of expansion). These neurons may encode direction of heading of self motion. Recent f-MRI studies demonstrated activation of MT/MST area in human brain by moving visual stimulation. Some f-MRI studies demonstrated specific activation of MST by non-retinotopic radial and circular optic flow, as well as non visual pursuit eye movement.


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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