The luminance origin of the pattern electroretinogram in man.

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Abstract
Electroretinograms (e.r.g.) and visually evoked potentials (v.e.p.) to pattern stimuli were recorded simultaneously from healthy subjects. The stimuli were produced by a configuration in which the luminance of 2 sets of spatial elements (checks) could be modulated independently. Experiments were designed to distinguish between contrast responses and non-linear luminance responses. The results suggest that the e.r.g. responses to pattern stimuli can be described on the basis of non-linear local luminance responses. Any contrast component, if present in the e.r.g., is smaller than the variance of the non-linear luminance responses.