Author:
Kochli Daniel E.,Thompson Elaine C.,Fricke Elizabeth A.,Postle Abagail F.,Quinn Jennifer J.
Abstract
Numerous investigations have definitively shown amygdalar involvement in delay and contextual fear conditioning. However, much less is known about amygdala contributions to trace fear conditioning, and what little evidence exists is conflicting as noted in previous studies. This discrepancy may result from selective targeting of individual nuclei within the amygdala. The present experiments further examine the contributions of amygdalar subnuclei to trace, delay, and contextual fear conditioning. Rats were trained using a 10-trial trace, delay, or unpaired fear conditioning procedure. Pretraining lesions targeting the entire basolateral amygdala (BLA) resulted in a deficit in trace, delay, and contextual fear conditioning. Immediate post-training infusions of the protein synthesis inhibitor, cycloheximide, targeting the basal nucleus of the amygdala (BA) attenuated trace and contextual fear memory expression, but had no effect on delay fear conditioning. However, infusions targeting the lateral nucleus of the amygdala (LA) immediately following conditioning attenuated contextual fear memory expression, but had no effect on delay or trace fear conditioning. In follow-up experiments, rats were trained using a three-trial delay conditioning procedure. Immediate post-training infusions targeting the LA produced deficits in both delay tone and context fear, while infusions targeting the BA produced deficits in context but not delay tone fear. These data fully support a role for the BLA in trace, delay, and contextual fear memories. Specifically, these data suggest that the BA may be more critical for trace fear conditioning, whereas the LA may be more critical for delay fear memories.
Funder
R15
Miami University College of Arts and Science
Miami University Undergraduate Research
Miami University Undergraduate Summer Scholar
Miami University Undergraduate Dean Scholar
Miami University DUOS
Publisher
Cold Spring Harbor Laboratory
Subject
Cellular and Molecular Neuroscience,Cognitive Neuroscience,Neuropsychology and Physiological Psychology
Cited by
69 articles.
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