Abstract
Intracellular recordings of bipolar cells were made in the isolated carp ( Cyprinus carpio) retina. The spectral response, the V-log I relation and the area-response amplitude relation of bipolar cells were studied with monochromatic and white lights. Out of 64 “on” center bipolars penetrated, 60 were considered to be rod-dominated bipolars (RB) and four as cone-dominated bipolars (CB). Out of 20 “off” center bipolars, eight RB and 12 CB were encountered. In the fully dark-adapted state, the RB cells were most responsive to 520 nm, while the CB cells were most responsive to 620 nm. The dynamic ranges of these two classes of cells were separated from each other by 1·0–1·5 log units. Furthermore, the time course of recovery and the waveform of both classes were very different from each other. The receptive field center of “on” center RB appeared to be narrower than that of “off” center CB.
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