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Fig. 5. Food deprivation for 5 days inhibits conditioned taste aversion (CTA)
memory formation. (A) The response to the conditioned stimulus (CS) in the
pre- and post-test sessions following the one-trial conditioning procedure in
snails deprived of food for 5 days. Memory was not formed as indicated by
there being no significant difference between the pre-test and post-test
response to the CS. (B) As in A, except that these snails received 10 paired
backward-conditioning (CS–US) presentations. Again, long-term memory
(LTM) was not observed even with this more intense conditioning. In both A and
B 40 snails were used. No significant differences in the feeding response were
found in either case (Student's t-test). All data are the means
± s.e.m. (N=40 each). These results show that 5 days of food
deprivation alters the internal state of the snail in such a manner that
memory for CTA cannot be formed.
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