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Fig. 7. Increasing RPeD1 impulse activity did not augment long-term memory
formation in operantly conditioned preparations. (A) In conditioned and
naïve preparations RPeD1 was depolarized (i.e. by injecting positive
current) for up to 20 min immediately after the completion of session 1 (and
after saline level had been raised). (B) Sample recordings in which RPeD1
impulse activity was increased in conditioned and naïve preparations
after the completion of training session 1 (arrowheads denote the time of the
depolarizing current injection in B and C). (C) Only the conditioned
preparations significantly reduced their number of attempted pneumostome
openings between sessions 1 and 2 (learning; t=2.477,
P<0.05), but not between session 1 and the memory test 18 h later
(LTM; t=1.012, P>0.05).
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