Abstract
Perfusion of the excised lateral eye of Limulus with sea water solutions of epinephrine, norepinephrine or dopamine increased the frequency of the spontaneous and light-initiated spike discharge and slightly depolarized eccentric and retinular cells; perfusion with solutions of 5-hydroxytryptamine and γ-aminobutyric acid decreased or abolished the spike discharge and hyperpolarized eccentric cells more than retinular cells. Small volumes (2–3 μl) of solutions of 5-hydroxytryptamine or γ-aminobutyric acid were most effective when applied behind the ommatidium under study. Ethanol blocked the inhibitory action of 5-hydroxytryptamine more effectively than that of γ-aminobutyric acid. These results suggest but do not prove that some or all of these substances play a role in the transmission of information in the visual system of the lateral eye of Limulus.
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