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The neurobiological basis of sex differences in learned fear and its inhibition

Day, Harriet L.L.; Stevenson, Carl W.

Authors

Harriet L.L. Day

Carl W. Stevenson



Abstract

Learning that certain cues or environments predict threat enhances survival by promoting appropriate fear and the resulting defensive responses. Adapting to changing stimulus contingencies by learning that such cues no longer predict threat, or distinguishing between these threat‐related and other innocuous stimuli, also enhances survival by limiting fear responding in an appropriate manner to conserve resources. Importantly, a failure to inhibit fear in response to harmless stimuli is a feature of certain anxiety and trauma‐related disorders, which are also associated with dysfunction of the neural circuitry underlying learned fear and its inhibition. Interestingly, these disorders are up to twice as common in women, compared to men. Despite this striking sex difference in disease prevalence, the neurobiological factors involved remain poorly understood. This is due in part to the majority of relevant preclinical studies having neglected to include female subjects alongside males, which has greatly hindered progress in this field. However, more recent studies have begun to redress this imbalance and emerging evidence indicates that there are significant sex differences in the inhibition of learned fear and associated neural circuit function. This paper provides a narrative review on sex differences in learned fear and its inhibition through extinction and discrimination, along with the key gonadal hormone and brain mechanisms involved. Understanding the endocrine and neural basis of sex differences in learned fear inhibition may lead to novel insights on the neurobiological mechanisms underlying the enhanced vulnerability to develop anxiety‐related disorders that are observed in women.

Journal Article Type Review
Publication Date Nov 7, 2019
Journal European Journal of Neuroscience
Print ISSN 0953-816X
Electronic ISSN 1460-9568
Publisher Wiley
Peer Reviewed Peer Reviewed
APA6 Citation Day, H. L., & Stevenson, C. W. (2019). The neurobiological basis of sex differences in learned fear and its inhibition. European Journal of Neuroscience, https://doi.org/10.1111/ejn.14602
DOI https://doi.org/10.1111/ejn.14602
Keywords Fear conditioning; Fear extinction; Fear discrimination; Fear generalization; Sex differences
Publisher URL https://onlinelibrary.wiley.com/doi/full/10.1111/ejn.14602

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