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Fig. 1. Intermediate-term and long-term memory in Lymnaea. (A) An interval
of 0.5 h between training sessions TS1 and TS2 results in an intermediate-term
memory (ITM) that persists for 3 h but not 24 h as observed during memory
tests (MT). (B) An interval of 1 h between the 30 min training sessions TS1
and TS2 results in a long-term memory (LTM) that persists for 3 h and at least
24 h after the last training session (TS2). Yoked controls (see text for
details) in A and B did not show ITM or LTM. *Significant difference in number
of openings from control TS1.