The study, conducted in Jamaica is titled "Impact of Cannabis on the Neurocognitive Performance of
Jamaican Adolescents" and was written by Karyl Powell-Booth, W De La Haye and Samantha Longman-Mills from the University of Technology and the University of the West Indies.
The study found that Cannabis users exhibited lower scores on all assessed neuropsychological functions as compared to non-users. However, the greatest mean differences were observed through significantly lowered Verbal Comprehension as well as Digit Span scores. This finding implicates cannabis use during adolescence with impairing the neurocognitive functions of working memory, attention, concentration, mental manipulation, language development and verbal intelligence.
Cannabis users also had significantly lower visual, verbal and working memory scores than those of non-cannabis users with the largest
differences being seen on the delayed subtests. The observance of significantly lower scores on the delayed subtests implies that the longterm memory of cannabis users may be more susceptibility to neurocognitive decline. Cannabis users had lower scores on all tests of learning, attention and memory than non-users.
The findings suggested that ganja use may have implications for poor school performance by teeage users. The sudy made the recommendation for increased public health policies aimed at targetting early prevention startegies, demand reduction, assessment and treatment of teens in a Jamaica.