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Fig. 5. Extinction and conditioned taste aversion memory. (A) Naive snails
(N=50) were first challenged with the sucrose taste. This elicited
robust feeding. Snails were then conditioned taste aversion (CTA) trained. 10
min after training, snails were given the conditional stimulus (CS) alone
(i.e. an extinction session) and the elicited feeding response noted. Snails
were designated as either good (N=40; closed boxes) or poor
(N=10; open boxes) performers. All snails received two more (at 10
min intervals) extinction sessions. Again in each extinction session the
elicited feeding response was noted. All snails were then challenged with the
sucrose stimulus 1 and 24 h later. Extinction did not occur. The three
extinction sessions did not result in a behavioral phenotype resembling the
naive state in either the good or the poor performers. (B) As in A, except
carrot juice was used as the CS. Similar results were obtained. All data are
means ± s.e.m. The differences between the feeding response of the good
performers and that of the poor performers in the both cases were maintained
for at least 24 h with *P<0.01 (Student's t-test),
showing that the memory formed by CTA training cannot be extinguished.
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