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The Journal of Neuroscience, May 15, 2003, 23(10):4029-4033

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BRIEF COMMUNICATION
Convergent Mechanisms Mediate Preparatory States and Repetition Priming in the Feeding Network of Aplysia

Alex Proekt and Klaudiusz R. Weiss

Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029-6574

Improvement of behavioral responses to expected stimuli has been attributed to a change in the preparatory state. In this study, we take advantage of the accessibility of the nervous system of Aplysia and develop an in vitro analog of the preparatory state for feeding behaviors. We provide evidence that the change in the preparatory state may be elicited initially by activity of identified serotonergic metacerebral cells (MCCs). We demonstrate, however, that the preparatory state is maintained through MCC-independent repetition priming that is embedded in the properties of the behavior-generating network. Both MCC-dependent and MCC-independent processes converge on the same site in the behavior-generating network to mediate the change in the preparatory state. Thus, we propose a model of how multiple neuronal structures interact to elicit and maintain changes in the preparatory states in the CNS.

Key words: Aplysia; repetition priming; preparatory states; metacerebral cells; central pattern generator; post-tetanic potentiation; anticipation; serotonin

Received Jan. 16, 2003; revised Mar. 10, 2003; accepted Mar. 10, 2003.




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