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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 …
Schizotypy And Psychosis-Like Experiences From Recreational Cannabis In A Non-Clinical Sample, Emma Barkus, Shon Lewis
Schizotypy And Psychosis-Like Experiences From Recreational Cannabis In A Non-Clinical Sample, Emma Barkus, Shon Lewis
Emma Barkus
Background. The relationship between cannabis use and psychosis is still a matter for debate. Accounting for the individual differences in subjective experiences to recreational cannabis use in the general population may hold some clues to the aetiological relationship between cannabis and psychotic symptoms. We hypothesized that schizotypy would account for the individual differences in subjective experiences after cannabis use but not in patterns of use. Method. In a sample of 532 young people who had used cannabis at least once, we examined the relationship between the Cannabis Experiences Questionnaire (CEQ) and the Schizotypal Personality Questionnaire (SPQ). Additionally, we examined the …