Crewther David P, Luu Chi D, Crewther Sheila G
Brain Sciences Institute, Swinburne University of Technology, Melbourne, Victoria, Australia.
Clin Exp Ophthalmol. 2002 Jun;30(3):231-4. doi: 10.1046/j.1442-9071.2002.00517.x.
The non-linearities of the diffuse flash visual evoked potential (VEP) have been shown to generate separable waves corresponding to Magnocellular and Parvocellular contributions. The authors wished to investigate whether, under conditions of isoluminance, the chromatic pattern appearance VEP shows waveforms that are related to both the processing of contours (the pattern) and the processing of the diffuse stimulation (from the area lying between the contours). The VERIS multifocal system was used to record monocular VEP. Standard 2-ring, 3-ring, 5-ring and 7-ring VERIS pattern stimuli were employed with a cardboard circular aperture used to blank the stimulus monitor to a 9-cm diameter field. The results for four subjects were recorded. The first order kernel responses showed a significant increase in amplitude with total contour length. In comparison, the amplitudes of the first and second slices of the second order kernel did not increase with contour length. It appears that the contour-dependent component has negligible non-linear components. It is proposed that the constant, non-zero responses of the higher order kernel components reflects contributions from the diffuse chromatic VEP.
扩散闪光视觉诱发电位（VEP）的非线性已被证明会产生与大细胞和小细胞贡献相对应的可分离波。作者希望研究在等亮度条件下，彩色图案外观VEP是否显示出与轮廓处理（图案）和扩散刺激处理（来自轮廓之间区域）相关的波形。使用VERIS多焦系统记录单眼VEP。采用标准的2环、3环、5环和7环VERIS图案刺激，并用硬纸板圆形孔径将刺激监视器遮挡为直径9厘米的视野。记录了四名受试者的结果。一阶核反应显示振幅随总轮廓长度显著增加。相比之下，二阶核的第一和第二切片的振幅并未随轮廓长度增加。看来轮廓相关成分的非线性成分可忽略不计。有人提出，高阶核成分的恒定非零反应反映了扩散彩色VEP的贡献。
