Abstract
Depolarizing overshoot responses at the cessation of a test light step were observed in horizontal cells (HCs) and in a population of photoreceptors (rod cs) in light-adapted retinas of the tiger salamander. An anode break regenerative conductance may contribute to the overshoot responses in rod cs (o-wave). The overshoot responses in HCs consist of two components: a fast α-wave whose amplitude and time course follow those of the o-wave; and a slow β-wave whose amplitude and time course vary with the HC membrane voltage. These results are consistent with the notion that the α-wave is a postsynaptic response to the voltage overshoots of the o-waves in rod cs and the β-wave is mediated by voltage-dependent conductances in the HC membrane. A possible function of the HC overshoot responses is to reset the amplitude of the light-adapted HC responses during repetitive or rapidly changing light stimulation.
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