The Electroencephalogram in Cannabis Associated Psychosis
D. R. Campbell
Canadian Psychiatric Association Journal April 1, 1971 DOI: 10.1177/070674377101600211 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational comparative study Peer reviewed |
|---|---|
| Sample size | 61 |
| Population | Patients with psychotic reactions after cannabis use, patients admitted with schizophrenia, patients seen for neurological consultation, and cannabis users without apparent psychiatric implications |
| Topics | Cannabis |
| Key findings | Cannabis users showed a greater increase in EEG abnormalities than patients with schizophrenia, neurological consultation patients, and cannabis users without psychiatric symptoms. The authors suggest cannabis may be a factor in creating the EEG abnormalities and in contributing to the psychotic reactions observed, especially when other causes of similar EEG abnormalities have been ruled out. |
Abstract
Comparison was made among the electroencephalograms of eleven patients with psychotic reactions after the use of cannabis, twenty-nine patients admitted with a diagnosis of schizophrenia, ten for neurological consultations and eleven cannabis users with no apparent psychiatric implications. It was found that there was a greater increase in the EEG abnormalities of cannabis users than in the rest. It is therefore suggested that the drug may be a factor in creating the EEG abnormalities as well as contributing to the psychotic reactions observed, especially when the other factors which could create similar EEG abnormalities have been ruled out.
Comparable studies
Other observational and cohort studies on cannabis, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| High-potency cannabis and the risk of psychosis People with first episode of psychosis and healthy controls from the local population | 2009 | Case-control study | n = 454 |
| Ayahuasca-Assisted Therapy for Addiction: Results from a Preliminary Observational Study in Canada Rural aboriginal population | 2013 | Observational study | |
| Impaired cognitive performance in drug free users of recreational ecstasy (MDMA) Otherwise healthy young people | 2000 | Observational | |
| Continued cannabis use and risk of incidence and persistence of psychotic symptoms: 10 year follow-up cohort study Individuals from the general population in Germany aged 14-24 at baseline | 2011 | Observational cohort | n = 1,923 |
| Cannabis-induced psychosis and subsequent schizophrenia-spectrum disorders: follow-up study of 535 incident cases Patients treated for cannabis-induced psychotic symptoms in Denmark between 1994 and... | 2005 | Observational cohort | n = 535 |