Prism adaptation with delayed visual error signals in the monkey
Prism adaptation with delayed visual error signals in the monkey
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DOI：
10.1007/s00221-002-1089-6
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发表时间：
2002-05-01
影响因子：
2
通讯作者：
Yin, PB
中科院分区：
文献类型：
--
作者：
Kitazawa, S;Yin, PB
通过用楔形棱镜移位视野而产生的伸展误差随着试验的进行而减少，即使直到运动完成时误差才被揭示。为了检验猴子在视觉反馈中可以补偿多少额外的延迟，研究了延迟视觉错误信号的效果，方法是在五个延迟之一(范围从0到500ms)之后呈现终端视觉图像。当延迟为0或10ms时，适应速度最快；当延迟为50ms时，适应能力显著下降；当延迟为500ms时，适应接近于零。后遗症的大小随延迟时间的延长而减小。结果表明，猴子对棱镜的适应在很大程度上取决于运动完成后50ms内视觉信息的可用性。与人类的结果相比较，我们认为猴子和人类有共同的适应机制，只有50ms的短时间窗口，但猴子缺乏另一种适应机制，允许人类的视觉延迟500ms或更多。
Errors in reaching produced by displacing the visual field with wedge prisms decrease with trials, even when the error is not revealed until the completion of the movement. To examine how much additional delay in visual feed-back the monkey can compensate for, the effects of delaying the visual error signals were studied by presenting the terminal visual images after one of five delays, ranging from 0 to 500 ms. Adaptation was fastest when the delay was 0 or 10 ms, decreased significantly with a delay as small as 50 ms and approached zero when the delay was 500 ms. The size of the after-effect decreased with the delay accordingly. The results indicate that prism adaptation in the monkey critically depends on the availability of visual information within 50 ms of completion of the movement. Comparing the results with those for humans, we suggest that monkey and human share a mechanism of adaptation with a short time window of 50 ms, but the monkey lacks another mechanism of adaptation that allows a visual delay of 500 ms or more in humans.