ANALYSIS OF SPATIAL DISTRIBUTION OF THE ERG COMPONENTS IN THE CARP RETINA

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Abstract
1. The change of polarity in the ERG observed when recording was made from illuminated area as opposed to ad jacent non-illuminated regions (MoToKAWA et al., 1959) was analyzed in the isolated inverted carp retina. 2. It was shown that, in the carp retina, the conventional PIII consists of at least two subcomponents ; the distal Pill which arises in the receptor cell layer and the proximal Pill emerging from a more proximal layer. These results are similar to those observed in the retinas of frogs and turtles (MURAKAMI and KANEKO, 1966). Isolation of the distal Pill by means of a coaxial microelectrode showed that the distal Pill was not involved in polarity reversal phenomenon. 3. Utilizing the chemical agents, ammonia vapor and ethyl alcohol, which influence the ERG components in specific manner, it was demonstrated that polarity reversal could be accounted for by different distributions of the proximal Pill and the PII component. The proximal Pill was produced within the illuminated area, while the PII component had a wider spatial distribution, not being restricted to the illuminated area. The algebraic summation of these components resulted in the apparent polarity reversal.

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