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The effects of pharmacological blockade of the proximal retinal activity by N-methyl-d-aspartate (MNDA) on the V–logI function of the ERG b- and d-waves were studied in dark and light adapted frog eyes. The effects of NMDA depended on the type of photoreceptor input. In rod-dominated ERG the b-wave amplitude was decreased by NMDA, but that of the d-wave remained unchanged. In cone-dominated ERG the...
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