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

Poster A8, Monday, October 8, 11:30 am - 1:00 pm, Essex Ballroom

Andrea Polari1,2,8, Suzie Lavoie1,2, Emily Li1,2, David Cicero3, Gaweda Lucasz4,5, Thomas Whitford7, Danny Koren6, Jessica Hartmann1,2, Barnaby Nelson1,2; 1Orygen, The National Centre of Excellence in Youth Mental Health, Australia, 2Centre for Youth Mental Health, The University of Melbourne, Australia, 3Department of Psychology, University of Hawaii at Manoa, Honolulu, HI, USA, 4Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, 5Department of Psychiatry, The Medical University of Warsaw, Poland, 6Psychology Department, University of Haifa, Haifa, Israel, 7Department of Psychology, University of New South Wales, 8Orygen Youth Health, Melbourne, Australia

Introduction 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 IPASE construct validity 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 A total of 46 participants were recruited from the Orygen Youth Health Clinical Program, a youth mental health service in northwestern Melbourne. Participants consisted of 21 ultra high risk (UHR) for psychosis individuals and 14 first episode psychosis (FEP) individuals. Eleven healthy control participants were recruited within the same age range as the patient groups (15-25 years). Participants were assessed with the EASE and the IPASE as part of a larger study examining the relationship between minimal self-disturbance and neurocognitive and neurophysiological variables in early psychosis. 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=.92) was apparent between IPASE and EASE total scores. Discussion These preliminary data indicate construct validity of the IPASE, demonstrating both convergent and discriminant validity. The IPASE may be suitable in contexts where it is not feasible to conduct a full EASE interview, i.e. assessment-heavy studies, such as large intervention trials, or as a screener instrument for more comprehensive assessment of anomalous subjective experiences but shouldn't replace the EASE to measure the construct of minimal self-disturbance, which requires considerable psychopathological sophistication.

Topic Area: Diagnosis and Phenomenology

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