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 Previous Article
Journal of Neuroscience, Vol 6, 1528-1536, Copyright © 1986 by Society for Neuroscience
Identification of the neural pathway for reinforcement of feeding when Aplysia learn that food is inedible
M Schwarz and AJ Susswein
Bilateral sectioning of the esophageal nerves that innervate the gut of
Aplysia was found to have profound effect on response decrement to inedible
food: Time to criterion for cessation of feeding was elevated, no memory of
the decrement was present 24 hr after training, and motor patterning during
training was altered. The parametric features of response decrement to
sustained lip stimulation were examined to determine their resemblance to
parameters of response decrement to inedible food after esophageal nerve
sectioning. Parameters of response decrement were similar, indicating that
after esophageal nerve sectioning response decrement is likely to be the
result of sustained lip stimulation. Bilateral nerve sectioning had no
effect on decrement due to sustained lip stimulation. Unilateral lesions
and lesions of either of the two major divisions of the esophageal nerves
had no effect on learning that food was inedible. The data indicate that
bilateral nerve sectioning eliminates all stimuli causing negative
reinforcement of feeding due to failure to consume food. Based on the data
in this and the previous paper, a model is presented suggesting sites of
action and mechanisms for learning that foods are edible or inedible in
Aplysia.
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