Subjects were given the twelfth grade versions of these tests (Iowa Tests of Educational Development) and other, computerized cognitive tests in successive test sessions.
"Heavy" marijuana use (defined by use seven or more times weekly) was associated with deficits in mathematical skills and verbal expression in the Iowa Tests of Educational Development and selective impairments in memory retrieval processes in Buschke's Test.
The retrieval impairments were restricted to words that were easy to visualize.
Impairments depended on the frequency of chronic marijuana use, i.e., "light" and "intermediate" marijuana use (defined by use one to four and five to six times weekly, respectively) were not associated with deficits.
Intermediate use was associated with superior performance in one condition ("fuzzy" concepts) of a Concept Formation test.
So, understanding their inability to focus on words after a few joints; do you want them driving past your kids' school and deciphering ... slow from speed ?
- Abstract from Effects of chronic marijuana use on human cognition, Robert I. Block and M. M. Ghoneim, 1992
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