Cited by 345Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchStress Responses and Cortisol

Efferent pathway of the amygdala involved in conditioned fear as measured with the fear-potentiated startle paradigm.

Hitchcock, Janice M., Davis, Michael·1991·Behavioral Neuroscience

Abstract

Fear-potentiated startle in the rat is a measure of conditioned fear that is blocked by lesions of the central nucleus of the amygdala. In a companion study, Rosen, Hitchcock, Sananes, Miserendino, and Davis (1991) demonstrated a direct anatomical projection from the central nucleus to the brainstem startle reflex circuit. In the present study, fear-potentiated startle was blocked by lesions that interrupted this pathway at 3 different levels or by a crossed lesion that interrupted the pathway at its source on one side and at a more caudal level on the other side. Although synaptic relays have not been ruled out entirely, the data suggest that the direct projection from the central nucleus of the amygdala to the startle circuit mediates the expression of fear-potentiated startle. These findings are consistent with the literature indicating that efferent projections from the central nucleus to various brainstem structures are involved in the expression of several conditioned fear responses.

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Crossref · 10.1037/0735-7044.105.6.826

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Authors
Hitchcock, J. M., & Davis, M.
Affiliations
Yale University (US)
Venue
Behavioral Neuroscience
Published
1991
Volume
105
Issue
6
Pages
826-842
ISSN
  • 0735-7044 (ISSN-L)
  • 1939-0084
OpenAlex
W1984415186
Cited by
345
References
59
Citations by year
2026: 2 · 2025: 3 · 2024: 27 · 2023: 5 · 2022: 2 · 2021: 5 · 2020: 4 · 2019: 10 · 2018: 4 · 2017: 6 · 2016: 9 · 2015: 13 · 2014: 10 · 2013: 9 · 2012: 10
FWCI
4.69
Type
journal article
Language
en
Open access
closed
Locations
  • Behavioral Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01mh041298-03)
  • National Institute of Mental Health (MH-41298, MH 25642, MH 47840, P01MH025642)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
central amygdala, fear-potentiated startle, fear conditioning, efferent projections, fear expression
MeSH terms
Amygdala, Animals, Association Learning, Brain Mapping, Brain Stem, Conditioning, Classical, Efferent Pathways, Fear, Male, Medulla Oblongata, Motivation, Synaptic Transmission, Neuronal Plasticity, Rats, Inbred Strains, Reflex, Startle, Substantia Innominata, Substantia Nigra, Tegmentum Mesencephali, Rats

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