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Fig. 2. `Changing memory'. (A) A second bout of ITM-training (TS3 and TS4) 24 h
after the first bout can cause LTM formation even if the behavioural phenotype
of memory is absent. Yoked control snails (Yoked), given tactile stimuli at
the same times as trained snails, did not exhibit LTM. (B) A 48 h interval
between the two bouts of ITM-training does not result in LTM. *Significant
difference in number of openings from control TS1 and TS3.