( Reference Mutluer, Şar, Kose-Demiray, Arslan, Tamer, Inal and Kaçar2018) did not show significant correlations between hippocampal volume and dissociative symptoms in a group of PTSD patients. On the other hand, there is also information to suggest absence of hippocampal volume reductions in individuals with a dissociative disorder (Weniger, Lange, Sachsse, & Irle, Reference Weniger, Lange, Sachsse and Irle2008) and a study by Mutluer et al. Amnesia has also been linked to the presence of psychological stress and/or traumatisation (Markowitsch & Staniloiu, Reference Markowitsch and Staniloiu2012 Staniloiu & Markowitsch, Reference Staniloiu and Markowitsch2012). Adverse childhood experiences further increase in the likelihood of childhood autobiographical memory deficits (Brown et al., Reference Brown, Anda, Edwards, Felitti, Dube and Giles2007). Left hippocampal volume reduction has further been associated with dissociative symptoms in individuals who suffered childhood sexual abuse as compared with healthy controls (HC) (Stein, Koverola, Hanna, Torchia, & McClarty, Reference Stein, Koverola, Hanna, Torchia and McClarty1997) indicating that early traumatisation is a potential mediator of dissociative symptoms. ( Reference Chalavi, Vissia, Giesen, Nijenhuis, Draijer, Cole and Reinders2015b) found evidence for hippocampal global and subfield volume reductions in relation to dissociative symptoms and/or traumatisation. Ehling, Nijenhuis, and Krikke ( Reference Ehling, Nijenhuis and Krikke2008) found bilateral global hippocampal volume reductions in individuals with DID, which negatively correlated with dissociative symptoms. Although dissociative amnesia is a core symptom of DID and of other dissociative disorders little is known about its neurobiological foundations.Ī few studies have found a negative correlation between dissociative symptoms and hippocampal volume. DID is a debilitating psychiatric condition and is related to, among others, alternating states of consciousness and distinct personality states with changing access to autobiographical information (American Psychiatric Association, 2013). The most severe of the dissociative disorders is dissociative identity disorder (DID). Dissociative amnesia is a dissociative symptom common in the dissociative disorders and is characterised by recurrent gaps in recalling everyday events and/or of important personal (trauma-related) information, distinct from ordinary forgetting.
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