撤光反应 off-response

互联网2013-11-14

1008

　　在一定时间所加的刺激撤除时所起的反应。例如脊椎动物的视神经纤维，对视网膜接受区的特定部位，在进行光的持续刺激中，兴奋被受抑制而全无反应，但遮光时，数秒钟之间便明显地显示着发出冲动（撤光反应）。照射时（ on）的反应称为给光反应；照射 -遮光两方面进行时的反应称为给光 -撤光反应。大脑皮质视觉中枢的神经元也是一样，由视网膜上特定部位的刺激而发生给光反应、撤光反应或给光 -撤光反应。

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