Arden G B
Department of Clinical Ophthalmology, Sydney University, NSW, Australia.
Vision Res. 1987;27(6):883-92. doi: 10.1016/0042-6989(87)90004-6.
Pattern electroretinograms (PERGs) have been recorded in man and pigeon using phase reversing patterns. Studies were made in both species of the effect of grating spatial frequency, grating profile (sine or square) or the size of the squares of a checkerboard on the amplitude of the responses. The results obtained in the two species were similar. In general, the ratio of the amplitudes of the sine wave:square wave responses is that predicted by the Fourier fundamentals of the pattern, and is thus not determined by changes in local luminance or contrast as it is normally defined. Checks however gave larger responses than sine or square wave profile bars matched to the Fourier fundamental on the diagonal. The results are not explicable in terms of any single stimulus parameter and suggest that the PERG generator has a degree of center/surround organisation similar to retinal ganglion cells. It is however argued that, because of the known physiological properties, generators cannot be unequivocally localised by varying the stimulus or comparing retinal, cortical and perceptual response dynamics.
使用相位反转图形在人类和鸽子身上记录了图形视网膜电图（PERG）。对这两个物种进行了研究，观察光栅空间频率、光栅轮廓（正弦或方形）或棋盘格方块大小对反应幅度的影响。在这两个物种中获得的结果相似。一般来说，正弦波与方波反应幅度的比值是由图形的傅里叶基波预测的，因此不像通常所定义的那样由局部亮度或对比度的变化决定。然而，棋盘格给出的反应比与对角线上的傅里叶基波匹配的正弦或方波轮廓条更大。这些结果无法用任何单一刺激参数来解释，这表明PERG发生器具有类似于视网膜神经节细胞的某种程度的中心/周边组织。然而，有人认为，由于已知的生理特性，无法通过改变刺激或比较视网膜、皮层和感知反应动力学来明确确定发生器的位置。
