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New research shows that heavy lifetime use of cannabis — more than 1,000 times — is associated with reduced activity in areas of the brain involved in working memory. The study adds to ...
The genes that are regulated are correlated with cell expansion biochemistry and physiology. In What a Plant Knows, David Chamovitz describes an experiment in which they test a plants long-term memory regarding past trauma. [15] While the experiment (stated above) concluded that plants can store trauma memory, the exact mechanism is unknown.
Researchers found that 63% of lifetime heavy cannabis-using participants and 68% of recent cannabis users showed reduced brain activity during their working memory task.
The observed effects on memory and learning, they said, showed long-term cannabis use caused "selective memory defects", but "of a very small magnitude". [85] A study by Johns Hopkins University School of Medicine found that heavy cannabis use is associated with decrements in neurocognitive performance even after 28 days of abstinence.
Individuals were considered heavy cannabis users if they had used marijuana more than 1,000 times in their lives; moderate users if they had used weed between 10 and 999 times; and nonusers if ...
Mice treated with tetrahydrocannabinol (THC) show suppression of long-term potentiation in the hippocampus, a process that is essential for the formation and storage of long-term memory. [52] These results may concur with anecdotal evidence suggesting that smoking cannabis impairs short-term memory. [53]
A 2012 review of cannabis use and dependency in the United States by Danovitch et al said that "42% of persons over age 12 have used cannabis at least once in their lifetime, 11.5% have used within the past year, and 1.8% have met diagnostic criteria for cannabis abuse or dependence within the past year. Among individuals who have ever used ...
Marijuana and THC can have a long-term impact, according to research. Experts say the effects of cannabis on adolescents can stick around after being high. Marijuana use may cause cognitive ...