Dissociative amnesia could be differentiated according to the degree and timeframe of impairment (global versus selective, anterograde versus retrograde) of autobiographical- episodic memory and the co-existence of deficits in autobiographical-semantic memory and general semantic knowledge. The most frequent types of dissociative amnesias are retrograde, a fact that is in fact captured by the diagnostic criteria of DSM-IV-TR (2000). The latter distinguishes between localized amnesia, selective amnesia, generalized amnesia, continuous amnesia and systematized amnesia. .
