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In Aplysia , long-term sensitization (LTS) occurs concurrently with a suppression of feeding. At the cellular level, the suppression of feeding is accompanied by decreased excitability of decision-making neuron B51. We examined the contribution of voltage-gated Na + and K + channels to B51 decreased excitability. In a pharmacologically isolated Na + channels environment, LTS training significantly increased B51 firing threshold, compared with untrained controls. Conversely, in a pharmacologically isolated K + channels environment, no differences were observed between trained and untrained animals in either amplitude or area of B51 K + -dependent depolarizations. These findings suggest that Na + channels contribute to the decrease in B51 excitability induced by LTS training.

Long-term sensitization training in Aplysia decreases the excitability of a decision-making neuron through a sodium-dependent mechanism