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The Journal of Neuroscience, September 15, 2000, 20(18):7059-7066
The Amygdala Modulates Memory Consolidation of Fear-Motivated
Inhibitory Avoidance Learning But Not Classical Fear Conditioning
Ann E.
Wilensky,
Glenn E.
Schafe, and
Joseph E.
LeDoux
W. M. Keck Foundation Laboratory of Neurobiology, Center for
Neural Science, New York University, New York, New York, 10003
Although the lateral and basal nuclei of the amygdala are believed
to be essential for the acquisition of Pavlovian fear conditioning, studies using post-training manipulations of the amygdala in the inhibitory avoidance learning paradigm have recently called this view
into question. We used the GABAA agonist muscimol to
functionally inactivate these nuclei immediately after single-trial
Pavlovian fear conditioning or single-trial inhibitory avoidance
learning. Immediate post-training infusions of muscimol had no effect
on Pavlovian conditioning but produced a dose-dependent effect on inhibitory avoidance. However, pre-training infusions dose-dependently disrupted Pavlovian conditioning. These findings indicate that the
amygdala plays an essential role in the acquisition of Pavlovian fear
conditioning and contributes to the modulation of memory consolidation
of inhibitory avoidance but not of Pavlovian fear conditioning.
Key words:
muscimol; memory; acquisition; consolidation; amygdala; inhibitory avoidance
Copyright © 2000 Society for Neuroscience 0270-6474/00/20187059-08$05.00/0
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