Post-traumatic stress disorder: Evolutionary perspectives

Cantor, C. (2009) Post-traumatic stress disorder: Evolutionary perspectives. AUSTRALIAN AND NEW ZEALAND JOURNAL OF PSYCHIATRY, 43 11: 1038-1048. doi:10.3109/00048670903270407


Author Cantor, C.
Title Post-traumatic stress disorder: Evolutionary perspectives
Journal name AUSTRALIAN AND NEW ZEALAND JOURNAL OF PSYCHIATRY   Check publisher's open access policy
ISSN 0004-8674
Publication date 2009-11
Year available 2009
Sub-type Article (original research)
DOI 10.3109/00048670903270407
Volume 43
Issue 11
Start page 1038
End page 1048
Total pages 11
Editor Peter Joyce
Place of publication United Kingdom
Publisher Informa Healthcare
Collection year 2010
Language eng
Subject C1
92 Health
11 Medical and Health Sciences
Abstract Fear is the key emotion of post-traumatic stress disorder (PTSD). Fear's evolved function is motivating survival via defensive behaviours. Defensive behaviours have been highly conserved throughout mammalian species; hence much may be learned from ethology. Predation pressure drove the early evolution of defences, laying foundations in the more ancient brain structures. Conspecific (same species) pressure has been a more recent evolutionary influence, but along with environmental threats it has dominated PTSD research. Anti-predator responses involve both avoiding a predator's sensory field and avoiding detection if within it, as well as escape behaviours. More effective avoidance results in less need for escape behaviours, suggesting that avoidance is biologically distinct from flight. Recognizing the predation, environmental and conspecific origins of defence may result in clearer definition of PTSD phenomena. Defence can also be viewed in the stages of no threat, potential threat, encounter and circa strike. Specific defences are used sequentially and according to contexts, loosely in the order: avoidance, attentive immobility, withdrawal, aggressive defence, appeasement and tonic immobility. The DSM-IV criteria and PTSD research show substantial congruence with the model proposed: that PTSD is a disorder of heightened defence involving six key defences used in conjunction with vigilance and risk assessment according to contexts. Human research is reviewed in this respect with reference to laboratory and wild animal observations providing new insights. Understanding individual perceptual issues (e.g. predictability and controllability) relevant to these phenomena, combined with defence strategy recalibration and neuronal plasticity research goes some way to explaining why some traumatized individuals develop PTSD when others do not.
Keyword defence
evolution
post-traumatic stress disorder
PREDATOR-PREY INTERACTIONS
SEXUAL ASSAULT SURVIVORS
HUMAN BRAIN EVOLUTION
TONIC IMMOBILITY
ANXIETY DISORDERS
FEAR-CIRCUITRY
ANIMAL-MODEL
DSM-V
BEHAVIOR
RAPE
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Medicine Publications
 
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Created: Sun, 22 Nov 2009, 00:08:19 EST