Behind the opaque curtain: a 20-year longitudinal study of dissociative and first-rank symptoms in schizophrenia-spectrum psychoses, other psychoses and non-psychotic disorders

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Authors

Colleges, School and Institutes

Abstract

Background: Depersonalization and derealization are currently considered diagnostically distinct from first-rank symptoms (FRS) seen in schizophrenia-spectrum psychoses. Nevertheless, the lived experiences of these symptoms can be very similar phenomenologically.

Aims: To investigate the interrelationships between depersonalization, derealization and FRS in individuals with different types of psychotic and non-psychotic diagnoses.

Methods: The Chicago Follow-up Study was a prospective longitudinal research program designed to study psychopathology and recovery in psychiatric disorders consisting of 555 participants, who were recruited at index hospitalization and studied over six follow-up timepoints at approximately 2, 4.5, 7.5, 10, 15, and 20 years later. The primary clinical indices were depersonalization, derealization and Schneiderian FRS that were measured at index hospitalization and at each subsequent follow-up.

Results: 62.8% of participants had at least four follow-ups. There were significant differences in the course and chronicity of depersonalization, derealization and first-rank symptoms across the three diagnostic groups. For the whole sample, derealization was significantly associated with FRS at 2-, 4.5- and 7.5-year follow-up timepoints whereas depersonalization was related to FRS from 10-year follow-up to 20-year follow-up. In participants with schizophrenia, overall depersonalization was more often associated with passivity phenomena whereas derealization was more often associated with overall delusions. There was also a significant effect of time on the associations between depersonalization, derealization and FRS across follow-ups.

Conclusions: Depersonalization and derealization should be viewed as transdiagnostic phenomena that are associated with FRS psychopathology along a continuum, although they are more closely associated with schizophrenia-spectrum psychoses.

Details

Original languageEnglish
JournalSchizophrenia Research
Early online date19 Sep 2020
Publication statusE-pub ahead of print - 19 Sep 2020

Keywords

  • Schizophrenia, Psychosis, Dissociation, Depersonalization, Derealization, First-rank symptoms