Quantification of some aspect of the psychological experience of dissociation. Dissociation in community samples is most commonly measured by the Dissociative Experiences Scale. The DSM-IV considers symptoms such as depersonalization, derealization and psychogenic amnesia to be core features of dissociative disorders. However, in the normal population, dissociative experiences that are not clinically significant are highly prevalent with 60% to 65% of the respondents indicating that they have had some dissociative experiences. The SCID-D is a structured interview used to assess and diagnose dissociation. The trait is EFO_0009750 (dissociation measurement). Also known as: dissociative symptom measurement.