Paul Frewen

“For example, Dell’s (2006b) Multidimensional Inventory of Dissociation (MID) is a highly regarded psychometric instrument specifically designed to provide a comprehensive, content-valid assessment of the more commonly observed experiences of persons with dissociative identity disorder, many of which represent prototypic descriptions of altered states of consciousness (e.g., depersonalization, derealization, posttraumatic flashbacks, and trance states, collectively described previously by Dell [2001] as instances of “pervasive dissociation”).”
― Paul Frewen, Healing the Traumatized Self: Consciousness, Neuroscience, Treatment

“although those who exhibit structural division of the personality commonly exhibit altered states of consciousness, only relatively few individuals who experience altered states of consciousness also exhibit structural divisions of the personality. To clarify the distinction, Steele and colleagues preferred to reserve the terms dissociation and dissociative for instances of structural division of the personality, with altered states of consciousness instead referred to simply as such (see also Nijenhuis & van der Hart, 2011). Steel and colleagues called for further investigation of the psychological and neurobiological underpinnings of both pathological alterations in consciousness and structural division of the personality. Trauma-Related”
― Paul Frewen, Healing the Traumatized Self: Consciousness, Neuroscience, Treatment