Thompson D A, Drasdo N
Hospital for Sick Children, London, UK.
Int J Psychophysiol. 1994 May;16(2-3):219-27. doi: 10.1016/0167-8760(89)90049-4.
A luminance response is spatially insensitive and dependent upon temporal contrast. The contribution of luminance to the pattern onset electroretinogram (PERG) can be estimated from the temporal contrast of a pattern's illuminance profile on the retina. A profile can be computed for different spatial frequencies by resynthesising the Fourier transform of the pattern after it has been filtered by the eye's MTF. A pure luminance response does not fully account for the amplitude of the PERG. The residual response is called "pattern specific". After the effects of spatial contrast degradation have been corrected for the response is spatially bandpass tuned with a peak that changes with eccentricity. An optimum foveal stimulus is estimated to be 3.5' arc. The pattern specific response component shows a correlation with inner nuclear and ganglion cell volumes. When the relationship of the luminance ERG with temporal contrast was explored empirically it was found to behave in good approximation to the theoretical predictions.
亮度响应在空间上不敏感，且依赖于时间对比度。可以根据视网膜上图案照度分布的时间对比度来估计亮度对图形起始视网膜电图（PERG）的贡献。通过对图案经眼睛的调制传递函数（MTF）滤波后的傅里叶变换进行重新合成，可以计算出不同空间频率下的分布。纯亮度响应不能完全解释PERG的幅度。剩余响应称为“图案特异性”。在对空间对比度退化的影响进行校正后，响应在空间上是带通调谐的，其峰值随偏心率而变化。据估计，最佳中央凹刺激为3.5分视角。图案特异性响应成分与内核和神经节细胞体积呈相关性。当通过实验探究亮度视网膜电图与时间对比度的关系时，发现其表现与理论预测非常接近。
