正负后像的电生理关联

Electrophysiological correlates of positive and negative afterimages.

作者信息

Burr D C, Fiorentini A, Morrone M C

出版信息

Vision Res. 1987;27(2):201-7. doi: 10.1016/0042-6989(87)90182-9.

Abstract

We report here measurements of visual evoked potential (VEP) activity after induction of afterimages in human observers. Drifting gratings normally produce no measurable phase synchronized VEP. However, after an afterimage of a high contrast grating of the same orientation and spatial frequency of that of the drifting grating has been flashed on the retina. VEPs in synchrony with the drift frequency are produced. For up to about two minutes after the flash, the VEPs were all clustered in one phase, then declined for a minute or so, to reappear 180 degrees out of phase from the first VEPs. The first group of VEPs coincides with the percept of a positive afterimage, and the second with that of a negative afterimage. Possible explanations for the existence of positive and negative afterimages and the associated VEPs are considered.

摘要

我们在此报告了对人类观察者诱发后像后视觉诱发电位（VEP）活动的测量结果。漂移光栅通常不会产生可测量的相位同步VEP。然而，当与漂移光栅具有相同方向和空间频率的高对比度光栅的后像在视网膜上闪现后，就会产生与漂移频率同步的VEP。在闪现后长达约两分钟的时间里，VEP都聚集在一个相位，然后下降约一分钟，之后以与最初的VEP相差180度的相位重新出现。第一组VEP与正后像的感知相对应，第二组与负后像的感知相对应。我们还考虑了正后像和负后像以及相关VEP存在的可能解释。