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The Journal of Neurophysiology Vol. 81 No. 4 April 1999, pp. 1983-1987
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
Department of Neurobiology and Anatomy and W.M. Keck Center for Neurobiology of Learning and Memory, The University of Texas-Houston Medical School, Houston, Texas 77030
Nargeot, R.,
D. A. Baxter,
G. W. Patterson, and
J. H. Byrne.
Dopaminergic synapses mediate neuronal changes in an analogue of
operant conditioning. Feeding behavior in Aplysia
can be modified by operant conditioning in which contingent
reinforcement is conveyed by the esophageal nerve (E n.). A neuronal
analogue of this conditioning in the isolated buccal ganglia was
developed by using stimulation of E n. as an analogue of contingent
reinforcement. Previous studies indicated that E n. may release
dopamine. We used a dopamine antagonist (methylergonovine) to
investigate whether dopamine mediated the enhancement of motor patterns
in the analogue of operant conditioning. Methylergonovine blocked
synaptic connections from the reinforcement pathway and the
contingent-dependent enhancement of the reinforced pattern. These
results suggest that dopamine mediates at least part of the neuronal
modifications induced by contingent reinforcement.
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