瞳孔控制系统采样特性的中枢机制

本文以双脉冲光分眼刺激（ｄｉｃｈｏｐｔｉｃ ｓｔｉｍｕｌａｔｉｎｇ，双脉冲的第一脉冲光刺激一侧眼，第二脉冲光刺激另一侧眼）进行瞳孔采样特性研究。实验结果表明：当双脉冲之间的时间间隔较长时，瞳孔产生两次收缩反应；当时间间隔小于约０．６ｓ时，瞳孔只对第一个脉冲光刺激产生瞬态收缩，对第二个脉冲光刺激不产生反应。这不仅证实了单眼实验研究的结论：瞳孔系统不是在时间上连续进行控制，而是离散的采样控制，它对光刺

THE CENTRAL BASIS OF DISCRETE SAMPLING BEHAVIOR IN THE HUMAN PUPILLARY CONTROL SYSTEM

The human pupillary control system was investigated with double-pulse light dichoptic stimulation to explore its discrete sampling behavior. In this dichoptic stimulating method, the first pulse of the double pulse light stimulated one eye, of which the pupil area was recorded, and the second pulse stimulated the other eye (the contralateral eye). The experiment data demonstrated that the pupillary control system requires a minimum time interval, approximately 0. 6 s, to elicit next transient response to the second light pulse, even though the two pulses were presented respectively to different eyes of the subject. The result supports the suggestion that the discrete sampling process exists in the pupillary control system. Moreover, it indicates that the minimum time interval is not caused by the retina adaptation, but determined by the central nerve system.