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Full-Text Articles in Social and Behavioral Sciences
Cannabis-Induced Psychosis-Like Experiences Are Associated With High Schizotypy, Emma Barkus, John Stirling, Richard Hopkins, Shon Lewis
Cannabis-Induced Psychosis-Like Experiences Are Associated With High Schizotypy, Emma Barkus, John Stirling, Richard Hopkins, Shon Lewis
Emma Barkus
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 …
Cannabis-Induced Psychotic-Like Experiences Are Predicted By High Schizotypy. Confirmation Of Preliminary Results In A Large Cohort., John Stirling, Emma Barkus, L Nabosi, S Irshad, G Roemer, B Schreudergoidheijt, Shon Lewis
Cannabis-Induced Psychotic-Like Experiences Are Predicted By High Schizotypy. Confirmation Of Preliminary Results In A Large Cohort., John Stirling, Emma Barkus, L Nabosi, S Irshad, G Roemer, B Schreudergoidheijt, Shon Lewis
Emma Barkus
Background: Cannabis use has been identified as a possible risk factor for developing schizophrenia. In a previous paper we reported preliminary evidence that cannabis use increases the likelihood of psychosis-like experiences in non-clinical respondents who scored highly on a measure of schizotypy. We now present findings from pooled data from 3 new follow-up studies comprising a sample of 477 respondents, of whom 332 reported using cannabis at least once. Sampling and Methods: As in our previous study, the psychological effects of cannabis were assessed with the Cannabis Experiences Questionnaire, from which 3 subscales can be derived; encompassing pleasurable experiences, psychosis-like …