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Journal of Neuroscience, Vol 6, 1513-1527, Copyright © 1986 by Society for Neuroscience
Learned changes of feeding behavior in Aplysia in response to edible and inedible foods
AJ Susswein, M Schwarz and E Feldman
Feeding behavior in Aplysia fasciata and A. oculifera is modified by
pairing the behavior with reinforcing consequences. Successful and
unsuccessful attempts to transfer food from the buccal cavity to the crop
act as positive and negative reinforcers, respectively. A number of changes
in feeding behavior occur as a result of pairing of feeding with the
negative reinforcer: feeding responses become less effective in leading to
the entry of food into the buccal cavity; when food does enter the buccal
cavity, it exits sooner; swallowing responses after food entry are less
likely to occur; Aplysia eventually cease responding to food. Pairing
successful transfer of food into the crop with feeding behavior produces
opposite effects. Behavioral change is specific to pairing, as shown by
lack of change when reinforcement is explicitly unpaired with feeding
behavior. Behavioral change is specific to foods with a particular taste
and texture; generalization to alternate foods was not observed. In spite
of cessation of feeding, animals remain aroused, as shown by low response
latency to alternate foods. Memory of response change persists for at least
48 hr.
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