“According to a study published online in the journal Psychiatry Research, individuals with bipolar disorder who used cannabis showed higher neurocognitive performance than patients who did not use cannabis.
Researchers at The Zucker Hillside Hospital in Long Island, NY, in collaboration with a team at the Mount Sinai School of Medicine and the Albert Einstein College of Medicine in New York City, examined the difference in cognitive performance among 50 individuals with bipolar disorder who had a history of cannabis use, with 150 bipolar patients who had no history of cannabis use.
The team discovered that patients who used cannabis showed superior neurocognitive performance than those who did not…
“These data could be interpreted to suggest that cannabis use may have a beneficial effect on cognitive functioning in patients with severe psychiatric disorders…””
http://www.medicalnewstoday.com/articles/249006.php