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Cannabis Use May Cause Temporary Cognitive Breakdown

Cannabis Use May Cause Temporary Cognitive BreakdownA provocative new study by Norwegian researchers suggests cannabis use causes a temporary cognitive breakdown in non-psychotic individuals.

Investigators believe this alteration in brain activity can lead to long-term psychosis.

In the study, researchers found a different brain activity pattern in schizophrenia patients with previous cannabis use than in schizophrenic patients without prior cannabis use.

The results reinforce the researcher’s belief that cannabis users suffering from schizophrenia actually may have higher cognitive abilities than non-cannabis-using schizophrenics.

This difference may indicate that the cannabis-user group did not have the same mental propensity for psychosis.

“While brain activity for both groups was similar, there are subtle differences between schizophrenia sufferers with a history of cannabis use and those who have never used cannabis.

“These differences lead us to believe that the cognitive weakness leading to schizophrenia is imitated by the effects of cannabis in otherwise non-psychotic people,” said Else-Marie Loeberg, Ph.D., of the University of Bergen, the lead author on the article.

Researchers studied 26 patients asking them to attempt difficult cognitive tasks while in the fMRI machine.

Participants were asked to listen to different syllables in each ear and try to say which syllable was spoken when instructed to concentrate on either the left or right ear—a difficult task for anyone.

The task is especially difficult for schizophrenia patients who often have impaired attention, limited executive functioning and difficulty in processing verbal cues.

Researchers discovered that schizophrenia sufferers with previous cannabis use had consistently higher levels of brain activity while undergoing these tests as well as a higher number of correct answers.

These results are congruent with previous earlier findings by the researchers that cannabis users with schizophrenic characteristics do not appear to suffer from the same neurocognitive weaknesses as other patients with schizophrenia.

This premise could imply that cannabis use leads otherwise non-psychotic individuals to potential psychosis by imitating the cognitive weakness that is a risk factor for developing the psychological condition.

Study findings are published in the journal Frontiers in Psychiatry.

Source: Frontiers

Woman smoking marijuana photo by shutterstock.

Cannabis Use May Cause Temporary Cognitive Breakdown

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2018). Cannabis Use May Cause Temporary Cognitive Breakdown. Psych Central. Retrieved on February 21, 2019, from
Scientifically Reviewed
Last updated: 8 Aug 2018
Last reviewed: By a member of our scientific advisory board on 8 Aug 2018
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