瞳孔控制系统非线性的频率特性与固有频率  

THE NONLINEAR FREQUENCY RESPONSES AND THE INHERENT FREQUENCY IN PUPILLARY CONTROL SYSTEM

作　　者：杨明[1] 赵信珍[1] 孙复川[1] 

机构地区：[1]中国科学院上海生理研究所

出　　处：《生物物理学报》1991年第3期384-390,共7页Acta Biophysica Sinica

基　　金：国家自然科学基金;中国科学院生物物理所视觉信息处理开放实验室课题

摘　　要：本文用实验方法从时域和频域上揭示了瞳孔对光反应的非线性特性.在亮度以正弦变化的光刺激下,瞳孔反应波形呈同步倍频现象;描述函数的频率-振幅特性曲线呈多峰的锯齿形;具有1.2Hz左右的系统固有频率和极限环现象.The nonlinearity of pupillary responses to light was explored experimentally in human subjects in both the frequency and the time domains. The waveforms of the pupillary responses to the sinusoidal light stimuli appear to be of synchronized frequency multiplication. The gain vs frequency curve of the describing function is of sawtooth-like with multiple peaks. The pupillary control system possesses a nature frequency of about 1.2 Hz and shows limit cycling characteristics. The results reveal that the nonlinear control mechanism with an internal feedback loop exists in the pupillary control system.

关 键 词：瞳孔控制系统 频率特性 固有频率 

分 类 号：Q811.4[生物学—生物工程]