THE CONSEQUENCES OF INACTIVATING AREAS V1 AND V5 ON VISUAL-MOTION PERCEPTION
THE CONSEQUENCES OF INACTIVATING AREAS V1 AND V5 ON VISUAL-MOTION PERCEPTION
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DOI：
10.1093/brain/118.1.49
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发表时间：
1995-02-01
期刊：
影响因子：
14.5
通讯作者：
ZEKI, S
中科院分区：
文献类型：
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作者：
BECKERS, G;ZEKI, S
我们研究了当 V1 或 V5 区域通过经颅磁刺激可逆失活时，正常人辨别视觉刺激运动方向的能力。我们发现（i）在视觉刺激开始之前或之后以 -20 至 +10 毫秒的间隔对 V5 进行磁刺激可有效消除运动知觉，而其他延迟则不然； (ii) V1 的磁刺激仅略微消除了运动知觉，且延迟时间与 V5 获得的延迟时间显着不同，现在刺激仅在视觉刺激开始后延迟 60-70 毫秒时才有效。我们得出的结论是 (i) 刺激 V5 是比刺激 VI 更有效的诱导运动不能（运动知觉）的方法； (ii)感知有效的视觉运动信号在30ms或之前达到V5并且在60ms或之前达到V1——因此，感知有效的运动信号在到达V1之前达到V5； (iii) 考虑到信号到达 V1 和 V5 的时间过程，信号从 V1 到达 V5 大约需要 30-50 ms。我们进一步得出结论，可能有两种成分从视网膜到达 V5，一种是绕过 V1 的快速成分，另一种是通过 V1 到达 V5 的慢速成分。
We studied the capacity of normal humans to discriminate the direction of motion of visual stimuli when areas V1 or V5 were reversibly inactivated with transcranial magnetic stimulation. We found that (i) magnetic stimulation of V5 at intervals of -20 to +10 ms before or after the onset of visual stimulation was effective in abolishing motion perception-other delays were not; (ii) magnetic stimulation of V1 abolished motion perception only marginally and at delays which were significantly different from those obtained with V5, the stimulation now being effective only at delays 60-70 ms after the onset of visual stimulation. We conclude (i) that stimulation of V5 is a much more potent way of inducing akinetopsia (motion imperception) than stimulation of VI; (ii) that perceptually effective visual motion signals reach V5 at or before 30 ms and reach V1 at or before 60 ms-consequently, perceptually effective motion signals reach V5 before they reach V1; (iii) that given the time course of arrival of signals in V1 and V5, it takes about 30-50 ms for signals from V1 to reach V5. We conclude further that there are probably two components reaching V5 from the retina, a fast one which bypasses V1 and a slow one which reaches it through V1.