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Fig. 4. Adults exhibit LTM but juveniles do not. (A) Adult (N=75) snails
subjected to the LTM training procedure exhibited LTM when tested 24 h after
the last training session (MT). That is, the criteria for LTM (the number of
attempted openings in MT was significantly less than in session 1 but was not
significantly greater than in session 2) were met. (B) Juvenile
(N=75) snails trained and tested in the same manner as the adults in
A did not meet the criteria necessary for LTM.