Abstract
1. 1. The photoreceptor unit (PRU) in the crayfish caudal abdominal ganglion was perfused by topical application of gamma amino butyric acid (GABA) and acetycholine (ACh), as well as their pharmacological potentiators and blockers. 2. 2. Using statistical analysis of emitted nerve pulse intervals, we found that GABA produced changes in the statistics resembling a surgically deafferented state, unlike natural inhibition. 3. 3. ACh strongly altered PRU nerve pulse output statistics in a manner resembling natural inhibition. 4. 4. These findings are compared with relevant vertebrate and invertebrate studies.
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