Findings of a study examining marijuana’s neurocognitive effects “suggest that prescribed medical cannabis may have minimal acute impact on cognitive function among patients with chronic health conditions”—which may come as a relief to long-term cannabis patients who are concerned about potential neurological drawbacks of the drug.
Authors of the report, published last month in the peer-reviewed journal CNS Drugs, wrote that they found “no evidence for impaired cognitive function when comparing baseline with post-treatment scores.”
To conduct the study, researchers had 40 people in Australia self-administer a single dose of medical marijuana in a laboratory setting, following instructions on the product label. Participants were then tested on an array of neuropsychological metrics—including multitasking, pattern recognition memory, reaction time, rapid visual information processing and spatial working memory, among others—and surveyed on their subjective experience.
“The absence of evidence for cognitive impairment following medical cannabis self-administration was surprising,” the study says, “given prior and substantive evidence that non-medical (‘recreational’) cannabis use reliably impairs a range of cognitive functions. At the same time, these findings are consistent with two systematic reviews published in the last year that suggest that medical cannabis, when used regularly and consistently for a chronic health concern, may have little if any impact on cognitive function.”
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