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Science 24 July 1970:
Vol. 169. no. 3943, pp. 379 - 381
DOI: 10.1126/science.169.3943.379
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Articles

Habituation and Dishabituation in the Absence of a Central Nervous System

Bertram Peretz 1

1 Department of Physiology and Biophysics, University of Kentucky College of Medicine, Lexington 40506

Habituation and dishabituation have been observed in a semi-intact Aplysia preparation in which the central nervous system is removed. The amplitude of withdrawal responses in the gill decreases in proportion to the rate of water drops applied (one drop per 0.5 minute to one drop per 2.5 minutes at 15°C). The effects of habituation last for at least 2 hours. A dishabituated response is elicited by stopping the water drops or electrically stimulating the preparation. Furthermore, the gill contains nerve cell bodies, and habituation and dishabituation appear to be properties of these peripheral neurons.


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