Abstract
ABSTRACT Pairs of light stimuli given at varying intervals causes changes in fast-adaptation characteristics in the bee moth Galleria mellonella. With increasing intervals between the stimuli of up to 1·0 sec there is a decrease in the amplitude of the visual response to the second stimulus. This depression of the response can be affected by a variety of agents which alter synaptic activity. Application of compounds such as Mg2* and nicotinic acid, which block synapses, to the optic ganglion lift depression. K+ and CO2 applied to the optic ganglion also abolish adaptation. Severing neuronal connexions between the retina and ganglion also lifts the depression. De-ganglionation and nicotinic acid also result in increases in absolute amplitude of the response. If Ca2+ is added to the Ringer bathing the ganglion, adaptation becomes more marked. These results suggest that the decreases in sensitivity following a brief light stimulus are mediated by synaptic feedback onto the receptor cells.
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