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Fig. 4. Operantly conditioned semi-intact preparations given only two training
sessions demonstrated learning, but not long-term memory. Conditioned
preparations demonstrated a significant reduction in attempted pneumostome
openings between session 1 and 2 (t=2.711, P<0.05)
indicating learning, but not between session 1 and the 18 h memory test
(t=0.1196, P>0.05). *P<0.05.