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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

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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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Authors: Hitchcock, J. M., & Davis, M.
Affiliations: Yale University (US)
Venue: Behavioral Neuroscience
Publisher: American Psychological Association (APA)
Published: 1991
Volume: 105
Issue: 6
Pages: 826-842
ISSN: 0735-7044 (ISSN-L)
1939-0084
DOI: 10.1037/0735-7044.105.6.826
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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Efferent pathway of the amygdala involved in conditioned fear as measured with the fear-potentiated startle paradigm.

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