The construct validity of the Inventory of Psychotic-Like Anomalous Self-Experiences (IPASE) as a measure of minimal self-disturbance: Preliminary data

Barnaby Nelson, Emily Li, David C. Cicero, Łukasz Gawęda, Jessica A. Hartmann, Danny Koren, Andrea Polari, Thomas J. Whitford, Suzie Lavoie

Research output: Contribution to journalArticlepeer-review

Abstract

Aim: The Inventory of Psychotic-Like Anomalous Self-Experiences (IPASE) is a self-report measure of minimal self-disturbance. The aim of the current report was to assess the construct validity of the scale by examining its convergent validity with the gold-standard measure of minimal self-disturbance, the Examination of Anomalous Self-Experience (EASE), and its discriminant validity. Method: The sample consisted of 46 participants (21 ultra-high risk for psychosis patients, 14 first episode psychosis patients, 11 healthy controls). Correlations between the clinical instruments were examined. Results: The IPASE correlated strongly with general psychopathology and positive psychotic symptoms, moderately with negative symptoms, and weakly with manic symptoms. The strongest correlation (r = 0.92) was apparent between IPASE and EASE total scores. Conclusion: These preliminary data indicate construct validity of the IPASE, demonstrating both convergent and discriminant validity. The IPASE may be suitable as a screener measure for minimal self-disturbance, but should not be used as a replacement to measure the construct of minimal self-disturbance, which requires considerable psychopathological sophistication.

Original languageEnglish
Pages (from-to)686-691
Number of pages6
JournalEarly Intervention in Psychiatry
Volume13
Issue number3
DOIs
StatePublished - Jun 2019

Bibliographical note

Publisher Copyright:
© 2018 John Wiley & Sons Australia, Ltd

Keywords

  • phenomenology
  • prodrome
  • psychometrics
  • psychopathology
  • ultra-high risk

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry
  • Psychiatric Mental Health

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