The applicability of the Bunsen-Roscoe law to the components of the human electroretinogram was investigated under conditions of moderate light adaptation. Simultaneous X and B waves were obtained with red test stimulation and A and B waves with white test stimulation. Both response amplitude and implicit time were measured. The A and X waves were found to adhere to the Bunsen-Roscoe law and have relatively constant implicit times. The response amplitude of the B waves showed systematic departures from a simple Bunsen-Roscoe model and their implicit times varied with both stimulus duration and luminance.
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