功能磁共振成像揭示了视觉皮层中不同全局运动结构的独立处理过程。

Separate processing of different global-motion structures in visual cortex is revealed by FMRI.

作者信息

Koyama Shinichi, Sasaki Yuka, Andersen George John, Tootell Roger B H, Matsuura Masato, Watanabe Takeo

机构信息

Department of Psychology, Boston University, 64 Cummington Street, Boston, Massachusetts 02215, USA.

出版信息

Curr Biol. 2005 Nov 22;15(22):2027-32. doi: 10.1016/j.cub.2005.10.069.

DOI:10.1016/j.cub.2005.10.069

PMID:16303562

Abstract

The visual system has the remarkable ability to extract several types of meaningful global-motion signals, such as radial motion, translation motion, and rotation, for different visual functions and actions. In the monkey brain, different groups of cells in MST respond best to different types of global motion [1, 2] whereas in lower cortical areas including MT, no such differential responses have been found. Here, we show that an area (or areas) lower than MST in the human brain [3] responds to different types of global motion. A series of human functional magnetic resonance imaging (fMRI) experiments, in which attention was controlled for, indicated that the center of radial motion activates the corresponding location in the V3A representation, whereas translation motion activates mainly in a more peripheral representation of V3A. These results suggest that in the human brain, V3A is an area that differentially responds according to the type of global motion.

摘要

视觉系统具有非凡的能力，能够提取多种类型的有意义的全局运动信号，如径向运动、平移运动和旋转，以用于不同的视觉功能和行为。在猴脑中，MST区的不同细胞群对不同类型的全局运动反应最佳[1,2]，而在包括MT区在内的较低皮质区域，尚未发现这种差异反应。在这里，我们表明，人类大脑中比MST区更低的一个（或几个）区域对不同类型的全局运动有反应。一系列控制了注意力的人类功能磁共振成像（fMRI）实验表明，径向运动的中心激活了V3A表征中的相应位置，而平移运动主要激活V3A更外围的表征。这些结果表明，在人类大脑中，V3A是一个根据全局运动类型做出差异反应的区域。