Göpfert E, Müller R, Simon E M
Carl Ludwig Institute of Physiology, School of Medicine, Karl Marx University, Leipzig, Germany.
Doc Ophthalmol. 1990 Sep;75(2):165-73. doi: 10.1007/BF00146552.
We studied amplitude of the wave N200 of the motion-onset VEP by varying the side length of a square stimulation field between 0.5 and 7 degrees. A significant increase in amplitude was obtained between 0.5 and 1 degree of side length in central stimulation and between 0.5 and 5 degrees in 10-degree peripheral stimulation. Variations of spatial frequency between 0.34 and 6.8c/deg did not modify the amplitude size, ie, no tuning effect could be found. The results of simultaneous and separate stimulation of foveal and parafoveal regions support the observation that the stimulation field size is a minor influence. Features of motion-sensitive cortical neurons, such as those found in monkeys, could account for this behavior.
我们通过将方形刺激场的边长在0.5至7度之间变化，研究了运动起始视觉诱发电位（VEP）的N200波幅。在中央刺激中，边长在0.5至1度之间时波幅显著增加；在10度周边刺激中，边长在0.5至5度之间时波幅显著增加。空间频率在0.34至6.8周/度之间变化时，波幅大小未改变，即未发现调谐效应。对中央凹和中央凹旁区域同时及分别进行刺激的结果支持了以下观察结果：刺激场大小的影响较小。运动敏感皮层神经元的特征，如在猴子身上发现的那些特征，可以解释这种现象。
