Abstract
Reversal potentials of color opponent responses were measured in H2 and H3 horizontal cells of the carp using Ca 2+ action potential method. All responses reversed around −5 mV, suggesting that the ionic mechanisms of light responses are common among all types of horizontal cells. Glutamate-induced depolarizations in H2 and H3 cells had the same reversal potentials as those of light responses, consistent with the idea that these cells receive glutamate-mediated inputs from the cones. Simultaneous recordings showed that depolarization of Hl cells by Ca 2+ action potential was transmitted to H2 cells in sign-inverted manner through a negative feedback interposed between these cells.
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