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Social and Behavioral Sciences Commons™
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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 …
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 …
Distress And Metacognition In Psychosis Prone Individuals: Comparing High Schizotypes To The At-Risk Mental State, Emma Barkus, John Stirling, Paul French, Anthony Morrison, Richard Bentall, Shon Lewis
Distress And Metacognition In Psychosis Prone Individuals: Comparing High Schizotypes To The At-Risk Mental State, Emma Barkus, John Stirling, Paul French, Anthony Morrison, Richard Bentall, Shon Lewis
Emma Barkus
Both schizotypy and at-risk mental states (ARMS: prodromal states) define individuals at risk for psychotic symptoms. However, the relationship between the 2 is unclear. ARMS individuals are, by definition, help-seeking and therefore at greater risk. We tested whether high schizotypes and ARMS exist along the same continuum by examining maladaptive metacognitions and distress. About 95 healthy volunteers (39% male; mean age, 22.8 years) completed the Schizotypal Personality Questionnaire, the Launay-Slade Hallucinations Scale, Metacognitions Questionnaire (MCQ), and the General Health Questionnaire, and 58 help seeking individuals with ARMS status (41% male; mean age, 22.2 years) completed the Metacognitions Questionnaire and General …