Impaired speed of visual information processing in marijuana intoxication.
D L Braff, L Silverton, D P Saccuzzo, D S Janowsky
American Journal of Psychiatry May 1981 DOI: 10.1176/ajp.138.5.613 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Double-blind crossover study Peer reviewed |
|---|---|
| Intervention | Marijuana |
| Topics | Cannabis |
| Key points | Marijuana did not affect critical stimulus duration, a measure of stimulus intake, but the visual backward masking results were compatible with the authors' proposal that marijuana slows information processing from labile unconscious iconic memory to more permanent memory processes. |
Abstract
The authors conducted a double-blind crossover study to investigate the effects of marijuana on visual information processing. The authors used a tachistoscopic paradigm, and the results show no marijuana effect on the critical stimulus duration, a measure of stimulus intake. The visual backward masking data are compatible with a marijuana-induced slowness of information processing from labile unconscious iconic memory to more permanent memory processes. These results are discussed in relation to reports of marijuana's effects on perception and early information processing.
Comparable studies
Other randomized controlled trials on cannabis, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Cannabidiol inhibits THC-elicited paranoid symptoms and hippocampal-dependent memory impairment Healthy participants | 2012 | Randomized controlled trial | n = 48 |
| Distinct Effects of Δ9-Tetrahydrocannabinol and Cannabidiol on Neural Activation During Emotional Processing Healthy, English-native, right-handed men who had used cannabis 15 times or less in... | 2009 | Double-blind, randomized, placebo-controlled crossover trial | n = 15 |
| Acute Effects of a Single, Oral dose of d9-tetrahydrocannabinol (THC) and Cannabidiol (CBD) Administration in Healthy Volunteers Healthy male subjects | 2012 | Randomized controlled trial | n = 16 |
| Modulation of Mediotemporal and Ventrostriatal Function in Humans by Δ9-Tetrahydrocannabinol Healthy, native English-speaking, right-handed men of white race/ethnicity who had used... | 2009 | Randomized controlled trial | n = 15 |
| Cannabidiol (CBD) content in vaporized cannabis does not prevent tetrahydrocannabinol (THC)-induced impairment of driving and cognition Healthy volunteers with a history of light cannabis use | 2019 | Randomized, double-blind, within-subjects crossover | n = 14 |
Citations in the library
Cited by 4
- Visual scan paths in first-episode schizophrenia and cannabis-induced psychosis Journal of Psychiatry and Neuroscience July 1, 2007
- Effects of ayahuasca on binocular rivalry with dichoptic stimulus alternation Psychopharmacology April 1, 2004
- Δ⁹Tetrahydrocannabinol impairs visuo-spatial associative learning and spatial working memory in rhesus macaques. Journal of Psychopharmacology October 2012
- Biomarkers for the effects of cannabis and THC in healthy volunteers. British Journal of Clinical Pharmacology January 2009