“Trauma-related structural dissociation should be distinguished from more ubiquitous phenomena that are often termed dissociation, but likely have a different underlying process. Over the past several decades the original meaning of dissociation has been quite extended by the addition of other phenomena not typically considered to be dissociative. These include alterations in consciousness such as absorption, daydreaming, imaginative involvement, altered time sense, trance-like behavior, and “highway hypnosis” (e.g., Bernstein & Putnam, 1986).” Dissociative Identity DisorderDissociationDissociativeDdnosStructural Dissociation Author:Onno van der Hart
“Comparing the hippocampal volume of mentally healthy subjects and patients with PTSD, DDNOS, and DID, thus patients with increasing levels of dissociation, an increasingly smaller volume is observed: PTSD (primary structural dissociation), approximately -10%; DDNOS (secondary structural dissociation), approximately -15%; and DID (tertiary structural dissociation), approximately -20%. These findings are characterized by a remarkable relationship: the more severe the structural dissociation of the personality, the smaller the hippocampal volume. Furthermore, Ehling et al. (2008) found high correlations between the volume of these brain structures and psychoform and somatoform symptoms, as well as with the severity of the reported potentially traumatizing events. Correlations between the volume of these brain structures and the degree of general psychopathology and fantasy-proneness were lower or statistically nonsignificant.” BrainPtsdDissociative Identity DisorderDissociative DisorderDdnosOsdd Author:Onno van der Hart