Neuronal Circuit Mediating Escape Responses in Crayfish

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Science  13 Aug 1971:
Vol. 173, Issue 3997, pp. 645-650
DOI: 10.1126/science.173.3997.645


The neuronal circuit underlying rapid abdominal flexion in response to phasic tactile stimulation comprises identified afferents, interneurons of two orders, a decision unit, and several motor neurons. The circuit is organized hierarchically as a " cascade" in which electrical synapses predominate at higher levels. Behavioral habituation results from lability at chemical junctions early in the pathway.