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Schizophrenia Bulletin 1999 25(2):363-375;
© 1999 by Oxford University Press and the Maryland Psychiatric Research Center (MPRC)
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© Oxford University Press

Validity and Usefulness of the Wisconsin Manual for Assessing Psychotic-like Experiences

Thomas R. Kwapil, Ph.D., Loren J. Chapman, Ph.D. and Jean Chapman, Ph.D.
Assistant Professor, University of North Carolina at Greensboro
Professor Emeritus, University of Wisconsin-Madison

Reprint requests should be sent to Dr. T.R. Kwapil, Dept. of Psychology, University of North Carolina-Greensboro, P.O. Box 26164, Greensboro, NC 27402-6164

The Wisconsin Manual for Assessing Psychotic-like Experiences is an interview-based assessment system for rating psychotic and psychotic-like symptoms on a continuum of deviancy from normal to grossly psychotic. The original manual contained six scales, assessing thought transmission, passivity experiences, thought withdrawal, auditory experiences, personally relevant aberrant beliefs, and visual experiences. A seventh scale assessing deviant olfactory experiences was subsequently added. The rating scales have good interrater reliability when used by trained raters. Cross-sectional studies indicated that the frequency and deviancy of psychotic-like experiences are elevated among college students who were identified, hypothetically, as psychosis prone by other criteria. Psychotic-like experiences of moderate deviancy in college students successfully predicted the development of psychotic illness and poorer overall adjustment 10 years later. The manual is useful for identifying psychosis-prone individuals and is recommended for use in linkage and treatment outcome studies. The present article provides an interview schedule for collecting information required for rating psychotic-like experiences.

Keywords: Psychotic-like experience / psychosis proneness / assessment


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