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Figure 4


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.