Research Index | Medline Index


Cannabis Research - cognition/memory


Authors
Schaeffer J, Andrysiak T, Ungerleider JT
Title
Cognition and long-term use of ganja (Cannabis).
Source
Science
Date
1981 Jul 24
Issue
213(4506)
Pages
465-6
Abstract
Neuropsychological variables and urine cannabinoid metabolites were evaluated in ten subjects born, raised, and educated in the United States and having histories of heavy or prolonged use of cannabis. No impairment of cognitive function was found. Cannabinoid metabolites in excess of 50 nanograms per milliliter were present in the ten urine samples. The tetrahydrocannabinol content of cannabis exceeded 8.0%.

Id Code
77214974
Authors
Darley CF, Tinklenberg JR, Roth WT, Vernon S, Kopell BS
Title
Marijuana effects on long-term memory assessment and retrieval.
Source
Psychopharmacology
Date
1977 May 9
Issue
52(3)
Pages
239-41
Abstract
The ability of 16 college-educated male subjects to recall from long-term memory a series of common facts was tested during intoxication with marijuana extract calibrated to 0.3 mg/kg delta-9-tetrahydrocannabinol and during placebo conditions. The subjects' ability to assess their memory capabilities was then determined by measuring how certain they were about the accuracy of their recall performance and by having them predict their performance on a subsequent recognition test involving the same recall items. Marijuana had no effect on recall or recognition performance. These results do not support the view that marijuana provides access to facts in long-term storage which are inaccessible during non-intoxication. During both marijuana and placebo conditions, subjects could accurately predict their recognition memory performance. Hence, marijuana did not alter the subjects' ability to accurately assess what information resides in long-term memory even though they did not have complete access to that information.

Id Code
86222841
Authors
Block RI, Wittenborn JR
Title
Marijuana effects on the speed of memory retrieval in the letter-matching task.
Source
International Journal of the Addictions
Date
1986 Feb
Issue
21(2)
Pages
281-5
Abstract
Marijuana's effect on the speed of retrieving simple information from memory was studied using a task in which subjects saw two letters and decided whether or not they had the same name. Subjects smoked a single marijuana or placebo cigarette under double-blind conditions. Marijuana slowed reaction time relative to placebo, but this effect was not influenced by the demands on memory retrieval or by providing advance information relevant to the required decisions, suggesting that memory retrieval was unimpaired.