In this study published online ahead of print in the journal Cannabis & Cannabinoid Research in November 2021, the authors examined the effects of THC on brain cell repair and improving short-term memory after a type of traumatic brain injury (TBI).
The doses used were 3mg/kg, or about 200mg for a 150lb person. The mice treated with THC showed "marked improvement" when performing on a Y-maze demonstrating an ability to reverse the deficit in working memory caused by the injury. There were several metrics in which the THC-treated mice showed improvement.
The authors conclusion speaks for itself:
"Administration of the phytocannabinoid Δ9-THC promotes significant functional recovery from traumatic brain injury (TBI) in the realms of working memory and locomotor function."
The article abstract is available at LiebertPub.com here.