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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A motion area in human visual cortex.
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A motion area in human visual cortex.

机译：人类视觉皮层中的运动区域。

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摘要

We have localized an area in the human brain involved in the processing of contours defined by motion differences (kinetic contours) by comparing with positron emission tomography the regional cerebral blood flow in tasks performed with kinetic and luminance-defined gratings. These tasks included passive viewing, counting the total number of grating stimuli, and counting the number of gratings of a given orientation. Comparison between the counting tasks and passive viewing with a given type of contour revealed a set of active areas that were similar for both luminance-defined and kinetic contours. Comparisons between these two types of contours revealed a single focus in the right hemisphere that did not overlap with the many regions activated by uniform motion. In particular this "kinetic focus" was clearly separated from the area previously defined as the human homologue of V5/middle temporal. Activity in this kinetic focus was stronger when orientation had to be processed than in the other two tasks. These results and control experiments with uniformly moving random dot patterns suggest the existence of an area in the human visual system that is activated much more by kinetic contours than by luminance contours or uniformly moving random dots. Up to now, such an area has not been described in the monkey visual system.
机译：通过与正电子发射断层摄影术比较使用动力和亮度定义的光栅执行的任务中局部脑血流，我们已经在人脑中定位了一个区域，该区域涉及由运动差异（运动轮廓）定义的轮廓处理。这些任务包括被动观察，计算光栅刺激的总数以及计算给定方向的光栅数量。在给定轮廓类型的计数任务和被动查看之间的比较显示出一组活动区域，这些活动区域对于亮度定义的轮廓和动态轮廓都是相似的。这两类轮廓之间的比较显示，右半球有一个焦点，与由匀速运动激活的许多区域没有重叠。特别地，该“运动焦点”与先前定义为V5 /中期的人类同源物的区域明显分开。与其他两个任务相比，在必须处理定向时，在该动力学焦点上的活动更强。这些结果和带有均匀移动的随机点图案的控制实验表明，人类视觉系统中存在一个区域，该区域更多地由动态轮廓激活，而不是由亮度轮廓或均匀移动的随机点激活。到目前为止，在猴子视觉系统中还没有描述这样的区域。

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