Cited by 149Memory and Neural MechanismsNeural and Behavioral Psychology StudiesNeurotransmitter Receptor Influence on Behavior

The DOI matches its Crossref record; 57 of the 57 references it cites were found in a registry or an index.

Immunohistochemical Analyses of Long-Term Extinction of Conditioned Fear in Adolescent Rats

Kim, J. H., Li, S., Richardson, R.·2011·Cerebral Cortex

Abstract

Adolescence is a period of heightened emotional reactivity and vulnerability to poor outcomes (e.g., suicide, anxiety, and depression). Recent human and animal neuroimaging studies suggest that dramatic changes in prefrontal cortical areas during adolescence are involved in these effects. The present study explored the functional implications of prefrontal cortical changes during adolescence by examining conditioned fear extinction in adolescent rats. Experiment 1 showed that preadolescent (i.e., postnatal day [P] 24), adolescent (P35), and adult (P70) rats express identical extinction acquisition following 3 white-noise conditioned stimulus (CS) and shock pairings. When tested the next day, however, adolescent rats showed almost complete failure to maintain extinction of CS-elicited freezing compared with P24 and P70 rats. It was observed in experiment 2 that following extinction, P24 and P70 rats express significantly elevated levels of phosphorylated mitogen-activated protein kinase (pMAPK) in the infralimbic cortex (IL) compared with adolescent rats. Interestingly, adolescent rats successfully exhibited long-term extinction if the amount of extinction training was doubled (experiment 3). More extinction training also led to increased phosphorylation of MAPK in the IL in these rats. These findings suggest that adolescents are less efficient in utilizing prefrontal areas, which may lead to an impairment in the maintenance of extinguished behavior.

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  1. 2007, 45, 1270
  2. 2005, Annals of the New York Academy of Sciences, 1021, 296
  3. 2007, 144, 961
  4. 2007, Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 33, 56

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Metadata

Authors
Kim, J. H., Li, S., & Richardson, R.
Affiliations
UNSW Sydney (AU)
Venue
Cerebral Cortex
Published
2010-06-24
Volume
21
Issue
3
Pages
530-538
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2159947310
Cited by
149
References
57
Citations by year
2026: 4 · 2025: 10 · 2024: 9 · 2023: 7 · 2022: 4 · 2021: 10 · 2020: 14 · 2019: 15 · 2018: 7 · 2017: 12 · 2016: 12 · 2015: 13 · 2014: 10 · 2013: 11 · 2012: 6
FWCI
4.26
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
Funders
Australian Research Council (DP0985554)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
adolescence, prefrontal cortex, infralimbic cortex, mitogen-activated protein kinase, MAPK phosphorylation, freezing behavior, late childhood, anxiety vulnerability
MeSH terms
Age Factors, Animals, Conditioning, Classical, Extinction, Psychological, Fear, Immunohistochemistry, Male, Phosphorylation, Rats, Sprague-Dawley, Prefrontal Cortex, Mitogen-Activated Protein Kinase Kinases, Rats

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