Paley R T, Sutija V G, Solan H A
Schnurmacher Institute for Vision Research, SUNY State College of Optometry.
Doc Ophthalmol. 1989 May;72(1):9-19. doi: 10.1007/BF00155209.
Evidence is controversial in respect to the optimal conditions in which visual evoked potentials provide an objective measure of binocular visual function, related and unrelated to stereopsis, and there is little emphasis on the type of stimulus that produces facilitation in binocular recording. We investigated the effects of stimulus type (flicker or pattern), contrast, and temporal modulation on facilitation, which was defined as a binocular response greater than sum of monocular responses. Monocular and binocular responses to sinusoidally modulated flicker and grating patterns were recorded in children and Fourier analyzed. The relationship of the fundamental Fourier component for flicker and the second harmonic component for pattern were each examined as function of temporal modulation at two levels of contrast for monocular and binocular visual evoked potentials. Binocular facilitation was found across all conditions for flicker. Data suggest that processing of pattern and flicker has different sites of origin within the visual system. Facilitation in binocular visual evoked potentials also indicates that they are not a result of simple summation of monocular responses, since there appears a nonlinear component to such interaction.
关于视觉诱发电位在何种最佳条件下能提供与立体视相关或不相关的双眼视觉功能的客观测量，证据存在争议，而且很少有人强调在双眼记录中能产生易化作用的刺激类型。我们研究了刺激类型（闪烁或图形）、对比度和时间调制对易化作用的影响，易化作用被定义为双眼反应大于单眼反应之和。记录了儿童对正弦调制闪烁和光栅图形的单眼和双眼反应，并进行了傅里叶分析。对于单眼和双眼视觉诱发电位，在两种对比度水平下，分别将闪烁的基波傅里叶分量和图形的二次谐波分量的关系作为时间调制的函数进行了研究。在所有闪烁条件下均发现了双眼易化作用。数据表明，图形和闪烁的处理在视觉系统内有不同的起源部位。双眼视觉诱发电位中的易化作用还表明，它们不是单眼反应简单叠加的结果，因为这种相互作用似乎存在非线性成分。
