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Depersonalization
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=== Ultimate mechanism === Depersonalization is a classic response to acute [[Psychological trauma|trauma]], and may be highly prevalent in individuals involved in different traumatic situations including [[motor vehicle collision]] and [[imprisonment]].<ref name=Sadock2017-DPD-Criteria-Change /> Psychologically depersonalization can, just like dissociation in general, be considered a type of coping mechanism, used to decrease the intensity of unpleasant experience, whether that is something as mild as [[Psychological stress|stress]] or something as severe as chronically high [[anxiety]] and [[post-traumatic stress disorder]].<ref name=Domain-Dissociation-1994 /> The decrease in [[anxiety]] and psychobiological hyperarousal helps preserving adaptive behaviors and resources under threat or danger.<ref name=Sadock2017-DPD-Criteria-Change /> Depersonalization is an overgeneralized reaction in that it doesn't diminish just the unpleasant experience, but more or less all experience – leading to a feeling of being detached from the world and experiencing it in a more bland way. An important distinction must be made between depersonalization as a mild, short-term reaction to unpleasant experience and depersonalization as a chronic symptom stemming from a severe mental disorder such as [[PTSD]] or [[dissociative identity disorder]].<ref name="Domain-Dissociation-1994">{{cite book |last1=Cardeña |first1=Etzel |chapter=The Domain of Dissociation |year=1994 |editor1-first=Steven J. |editor1-last=Lynn |editor2-first=Judith W. |editor2-last=Rhue |title=Dissociation: Clinical and theoretical perspectives |pages=15–31 |location=New York |publisher=[[Guilford Press]] |isbn=978-0-89862-186-0}}</ref> Chronic symptoms may represent persistence of depersonalization beyond the situations under threat.<ref name=Sadock2017-DPD-Criteria-Change />
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