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Vol. 39, No. 4, 2006
Issue release date: June 2006
Section title: Original Paper
Psychopathology 2006;39:175–178
(DOI:10.1159/000092678)

Cannabis-Induced Psychosis-Like Experiences Are Associated with High Schizotypy

Barkus E.J. · Stirling J. · Hopkins R.S. · Lewis S.
aNeuroscience and Psychiatry Unit, University of Manchester, and bDepartment of Psychology and Speech Pathology, Manchester Metropolitan University, Manchester, UK

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 7/27/2004
Accepted: 7/7/2005
Published online: 6/13/2006

Number of Print Pages: 4
Number of Figures: 0
Number of Tables: 0

ISSN: 0254-4962 (Print)
eISSN: 1423-033X (Online)

For additional information: http://www.karger.com/PSP

Abstract

Objective: Recent studies have suggested that cannabis use is a risk factor for developing schizophrenia. We tested the hypothesis that cannabis use increases the likelihood of psychosis-like experiences in non-clinical participants who scored highly on a measure of schizotypy. Method: The psychological effects of cannabis were assessed in 137 healthy individuals (76% female, mean age 22 years) using a newly developed questionnaire concerned with subjective experiences of the drug: the Cannabis Experiences Questionnaire. The questionnaire has three subscales: Pleasurable Experiences, Psychosis-Like Experiences and After-Effects. Respondents also completed the brief Schizotypal Personality Questionnaire. Results: Cannabis use was reported by 72% of the sample. Use per se was not significantly related to schizotypy. However, high scoring schizotypes were more likely to report both psychosis-like experiences and unpleasant after-effects associated with cannabis use. The pleasurable effects of cannabis use were not related to schizotypy score. Conclusion: High scoring schizotypes who use cannabis are more likely to experience psychosis-like phenomena at the time of use, and unpleasant after-effects. Our results are consistent with the hypothesis that cannabis use is a risk factor for full psychosis in this group.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 7/27/2004
Accepted: 7/7/2005
Published online: 6/13/2006

Number of Print Pages: 4
Number of Figures: 0
Number of Tables: 0

ISSN: 0254-4962 (Print)
eISSN: 1423-033X (Online)

For additional information: http://www.karger.com/PSP


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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