Cited by 107Memory and Neural MechanismsStress Responses and CortisolNeurotransmitter Receptor Influence on Behavior

Developmental rodent models of fear and anxiety: from neurobiology to pharmacology

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Ganella, Despina E, Kim, Jee Hyun·2014·British Journal of Pharmacology

Abstract

Anxiety disorders pose one of the biggest threats to mental health in the world, and they predominantly emerge early in life. However, research of anxiety disorders and fear-related memories during development has been largely neglected, and existing treatments have been developed based on adult models of anxiety. The present review describes animal models of anxiety disorders across development and what is currently known of their pharmacology. To summarize, the underlying mechanisms of intrinsic 'unlearned' fear are poorly understood, especially beyond the period of infancy. Models using 'learned' fear reveal that through development, rats exhibit a stress hyporesponsive period before postnatal day 10, where they paradoxically form odour-shock preferences, and then switch to more adult-like conditioned fear responses. Juvenile rats appear to forget these aversive associations more easily, as is observed with the phenomenon of infantile amnesia. Juvenile rats also undergo more robust extinction, until adolescence where they display increased resistance to extinction. Maturation of brain structures, such as the amygdala, prefrontal cortex and hippocampus, along with the different temporal recruitment and involvement of various neurotransmitter systems (including NMDA, GABA, corticosterone and opioids) are responsible for these developmental changes. Taken together, the studies described in this review highlight that there is a period early in development where rats appear to be more robust in overcoming adverse early life experience. We need to understand the fundamental pharmacological processes underlying anxiety early in life in order to take advantage of this period for the treatment of anxiety disorders.

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  • Early memories contribute to anxiety disorders.

    “This notion that early memories contribute to anxiety disorders is still widely held [review in Ref. (96)] and is a component of the present explanatory framework for nightmares.”

    From The Stress Acceleration Hypothesis of Nightmares (2017) · cites this paper as [96]

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  1. Freud S, Breuer J (1893) On the psychical mechanism of hysterical phenomena: preliminary communications. In: Strachey J, Strachey A (eds). Studies in hysteria. Harmonsworth Penguin: London, 1974, pp. 53-69.

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Authors
Ganella, D. E., & Kim, J. H.
Affiliations
The University of Melbourne (AU)
Corresponding author
Kim, Jee Hyun
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2014-07
Volume
171
Issue
20
Pages
4556-4574
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W1490288863
Cited by
107
References
232
Citations by year
2026: 5 · 2025: 11 · 2024: 6 · 2023: 6 · 2022: 13 · 2021: 11 · 2020: 13 · 2019: 6 · 2018: 6 · 2017: 12 · 2016: 8 · 2015: 6 · 2014: 4
FWCI
0.97
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
Australian Research Council (DE120100110)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
anxiety disorders, fear, learned fear, infantile amnesia, fear extinction, stress hyporesponsive period, prefrontal cortex, hippocampus, NMDA receptor, GABA, corticosterone, opioids, early life experience, adolescence
MeSH terms
Animals, Anxiety, Avoidance Learning, Brain, Disease Models, Animal, Fear, Humans, Synaptic Transmission, Reflex, Startle, Vocalization, Animal

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