视动震颤(OKN)眼动控制系统中的颜色通道

THE EXISTENCE OF CHROMATIC CHANNELS FOR MOTION DETECTION IN THE OPTOKINETIC SYSTEM

用亮度相等的不同颜色构成的等亮度彩色运动条纹(Isoluminant chromatic moving gratings)来进行OKN眼动跟踪实验,探讨它是否与由亮度差别构成的黑白运动条纹图象一样引起OKN反应。实验结果表明在等亮度彩色运动条纹图象(没有亮度差别只有颜色差别)刺激下,视动系统可产生与黑白运动条纹刺激下同样的OKN反应,并且与各单原色运动条纹刺激下的OKN反应也一致。说明0KN眼动跟踪中的运动检测存在颜色通道。本文并提出了一种基于颜色的运动检测模型。

Isoluminant chromatic moving gratings which contain only color difference but no luminance difference were designed as stimuli for Optokinetic nystagmus (OKN) experiments. The explicit OKN responses were elicited by the isolumin-ant chromaitc moving gratings. The gains and nystagmus frequencies of OKN responses induced hy the isoluminant chromatic red/green, red/blue, and blue /green moving gratings are very similar to those elicited by white/black, red/ black, green/black, and blue/black moving gratings. These results indicate the existence of chromatic channels for motion detection in OKN control system. Finally, a model with chromatic channels for motion detection was provided.