Chakraborty S, Tumosa N, Lehmkuhle S
School of Optometry, University of Missouri-St. Louis, 63121, USA.
Exp Brain Res. 1998 Sep;122(2):203-13. doi: 10.1007/s002210050508.
Visually evoked potentials (VEPs) measured under conditions of retinal image stabilization that minimized the influences of visual masking and smearing were averaged from electroencephalographic records measured from striate cortex of three cats. The amplitudes of the VEPs increased around saccade initiation. The grating-evoked potentials obtained at different times relative to the saccade exhibited changes in waveform shape that could be attributed to a saccade-evoked potential. The changes in the shape of the waveform were reasonably accounted for by the summation of the grating-evoked potential (produced when the cat did not make a saccade) and an appropriately timed saccade-evoked potential. The fundamental amplitudes of the residual potentials were computed and found to vary across the time course of the saccade. These observations suggest that there are other influences besides visual masking that are exerted early in the visual pathway to modulate visual processing during saccadic eye movements. A corollary discharge process is the most likely candidate to exert these influences.
在视网膜图像稳定的条件下测量视觉诱发电位（VEP），以尽量减少视觉掩蔽和模糊的影响，并从三只猫的纹状皮层记录的脑电图中进行平均。VEP的振幅在扫视开始时增加。相对于扫视在不同时间获得的光栅诱发电位表现出波形形状的变化，这可归因于扫视诱发电位。波形形状的变化可以通过光栅诱发电位（猫不进行扫视时产生）和适当定时的扫视诱发电位的总和得到合理的解释。计算了残余电位的基本振幅，发现其在扫视的时间过程中有所变化。这些观察结果表明，除了视觉掩蔽之外，在视觉通路早期还有其他影响因素在扫视眼动期间调节视觉处理。一种推论放电过程最有可能是施加这些影响的因素。
