Abstract
In depth recording studies, the ERG components have usually been localized on the basis of points of maximal amplitude or polarity reversal. However, these criteria are contingent upon definite forms of potential distribution of the ERG. According to an analysis by HASHIMOTO et al.(1961), an alternative criterion based on the point of maximal potential gradient is not so restricted in application.
Localization of the ERG components in the carp retina on the basis of the latter criterion revealed that the distal PIII originates in the receptor cell layer whereas both the PII and proximal PIII are generated in the bipolar cell layer. These findings are very similar to data obtained on the frog and turtle eye.
