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Cannabis increases the noise in your brain

Date:
December 3, 2015
Source:
Elsevier
Summary:
Several studies have demonstrated that the primary active constituent of cannabis, delta-9-tetrahydrocannabinol, induces transient psychosis-like effects in healthy subjects similar to those observed in schizophrenia. However, the mechanisms underlying these effects are not clear. A new study shows that this active ingredient increases random neural activity, termed neural noise, in the brains of healthy human subjects. The findings suggest that increased neural noise may play a role in the psychosis-like effects of cannabis.
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Cannabis.
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Several studies have demonstrated that the primary active constituent of cannabis, delta-9-tetrahydrocannabinol (∆9-THC), induces transient psychosis-like effects in healthy subjects similar to those observed in schizophrenia. However, the mechanisms underlying these effects are not clear.

A new study, published in the journal Biological Psychiatry, reports that ∆9-THC increases random neural activity, termed neural noise, in the brains of healthy human subjects. The findings suggest that increased neural noise may play a role in the psychosis-like effects of cannabis.

"At doses roughly equivalent to half or a single joint, ∆9-THC produced psychosis-like effects and increased neural noise in humans," explained senior author Dr. Deepak Cyril D'Souza, a Professor of Psychiatry at Yale School of Medicine.

"The dose-dependent and strong positive relationship between these two findings suggest that the psychosis-like effects of cannabis may be related to neural noise which disrupts the brain's normal information processing," added first author Dr. Jose Cortes-Briones, a Postdoctoral Associate in Psychiatry at Yale School of Medicine.

The investigators studied the effects of ∆9-THC on electrical brain activity in 24 human subjects who participated in a three-day study during which they received two doses of intravenous ∆9-THC or placebo in a double-blind, randomized, cross-over, and counterbalanced design.

If confirmed, the link between neural noise and psychosis could shed light on the biology of some of the symptoms associated with schizophrenia.

"This interesting study suggests a commonality between the effects on the brain of the major active ingredient in marijuana and symptoms of schizophrenia," stated Dr. John Krystal, Editor of Biological Psychiatry. "The impairment of cortical function by ∆9-THC could underlie some of the cognitive effects of marijuana. Not only does this finding aid our understanding of the processes underlying psychosis, it underscores an important concern in the debate surrounding medical and legalized access to marijuana."


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Materials provided by Elsevier. Note: Content may be edited for style and length.


Journal Reference:

  1. Jose A. Cortes-Briones, John D. Cahill, Patrick D. Skosnik, Daniel H. Mathalon, Ashley Williams, R. Andrew Sewell, Brian J. Roach, Judith M. Ford, Mohini Ranganathan, Deepak Cyril D’Souza. The Psychosis-like Effects of Δ9-Tetrahydrocannabinol Are Associated With Increased Cortical Noise in Healthy Humans. Biological Psychiatry, 2015; 78 (11): 805 DOI: 10.1016/j.biopsych.2015.03.023

Cite This Page:

Elsevier. "Cannabis increases the noise in your brain." ScienceDaily. ScienceDaily, 3 December 2015. <www.sciencedaily.com/releases/2015/12/151203082207.htm>.
Elsevier. (2015, December 3). Cannabis increases the noise in your brain. ScienceDaily. Retrieved September 27, 2016 from www.sciencedaily.com/releases/2015/12/151203082207.htm
Elsevier. "Cannabis increases the noise in your brain." ScienceDaily. www.sciencedaily.com/releases/2015/12/151203082207.htm (accessed September 27, 2016).