Abstract
1. 1. In the marine mollusc Aplysia californica, the gill withdrawal reflex was found to be functional in the posterior gill half which had been isolated from input by the central nervous system, the siphon-gill peripheral nervous system, and the gill and genital ganglia. This was not a local pinnule response. 2. 2. The reflex habituated to a repetitive, direct tactile stimulus, and dishabituated upon the application of a novel or intense stimulus. Complete spontaneous recovery from the habituated state occurred in about 3 hr. 3. 3. Habituation rate of the withdrawal reflex in the isolated gill half was influenced by the intensity of stimulation and the time allowed for spontaneous recovery between stimulus series. 4. 4. We conclude that the neural plexus in the Aplysia gill is sufficient to mediate the gill withdrawal reflex and its habituation elicited by direct tactile stimulation. Five of the nine parameters which characterize habituation have been demonstrated.
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