Electrically evoked responses (E-responses) of L-and C-type horizontal cells in the carp retina

Electrically evoked responses (E-responses) of L-and C-type horizontal cells produced by transretinal stimulation were studied under chromatic illumination in the carp retina. From the examination of E-S relations (E-response verus S-potential) and of the shape of both responses the following results were obtained: (1) Equilibrium potential of subsynaptic membrane is estimated as 0 to 10 mV above zero membrane potential. (2) L-cells receive signals from red-and probably from green-sensitive cones and feed them back to the former. (3) The depolarizing response to red light of C-cells is produced by delayed and reversed signals from L-cells. Thus the model proposed by W.K. Stell, D. O. Lightfoot, and T. G. Wheeler (Science, 1975, 190,989-990) is supported.