Tablet-based tests detected cognitive impairment after smoking cannabis
A tablet-based neurocognitive test battery detected acute impairment from cannabis smoking, with occasional users showing larger deficits than daily users.
Quick Facts
What This Study Found
Factor analysis identified a single latent construct underlying reaction time, decision making, working memory, and spatial-motor performance. Cannabis smoking produced measurable impairment on this construct, with occasional users more affected than daily users.
Key Numbers
Four cognitive domains tested: reaction time, decision making, working memory, and spatial-motor performance. Occasional users showed greater impairment than daily users after acute cannabis smoking.
How They Did This
Participants completed a tablet-based neurocognitive test before and after smoking cannabis (or a rest period for controls). Exploratory factor analysis reduced test dimensions, and regression models quantified impairment by user group.
Why This Research Matters
Developing reliable, portable tools for detecting cannabis impairment is important for roadside testing, workplace safety, and clinical assessment. Current field sobriety tests were designed for alcohol, not cannabis.
The Bigger Picture
As cannabis legalization expands, the need for practical impairment detection tools grows. Unlike alcohol, there is no widely accepted cannabis equivalent of a breathalyzer. Tablet-based cognitive testing could fill that gap if validated at scale.
What This Study Doesn't Tell Us
Study conducted in a legal-use state, which may affect generalizability. Comparison between daily and occasional users confounds tolerance with other behavioral differences. No standardized cannabis dose. Ecological validity of tablet tests for real-world impairment is unestablished.
Questions This Raises
- ?How does this test battery perform compared to standardized field sobriety tests?
- ?What threshold score should indicate impairment for practical applications?
Trust & Context
- Key Stat:
- Occasional users showed greater impairment than daily users after smoking
- Evidence Grade:
- Observational study with a novel assessment tool. Reasonable design but limited by lack of dose standardization and unestablished real-world validity.
- Study Age:
- Published 2022.
- Original Title:
- A Latent Variable Analysis of Psychomotor and Neurocognitive Performance After Acute Cannabis Smoking.
- Published In:
- Cannabis (Albuquerque, N.M.), 6(2), 123-132 (2023)
- Authors:
- Smith, Shelby J, Wrobel, Julia(9), Brooks-Russell, Ashley(20), Kosnett, Michael J, Sammel, Mary D
- Database ID:
- RTHC-04951
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Why are occasional cannabis users more impaired than daily users?
Regular cannabis users develop tolerance, meaning their brains partially adapt to the presence of THC. Occasional users lack this adaptation, so the same amount of THC produces a larger cognitive effect. This does not mean daily users are unimpaired; their baseline performance may already be affected.
Could a tablet test replace a breathalyzer for cannabis?
Not yet. This study shows tablet-based tests can detect group-level impairment after cannabis use, but translating that to an individual-level pass/fail determination is much harder. Individual variation in cognitive ability, tolerance, and other factors make threshold-setting challenging.
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Cite This Study
https://rethinkthc.com/research/RTHC-04951APA
Smith, Shelby J; Wrobel, Julia; Brooks-Russell, Ashley; Kosnett, Michael J; Sammel, Mary D. (2023). A Latent Variable Analysis of Psychomotor and Neurocognitive Performance After Acute Cannabis Smoking.. Cannabis (Albuquerque, N.M.), 6(2), 123-132. https://doi.org/10.26828/cannabis/2023/000156
MLA
Smith, Shelby J, et al. "A Latent Variable Analysis of Psychomotor and Neurocognitive Performance After Acute Cannabis Smoking.." Cannabis (Albuquerque, 2023. https://doi.org/10.26828/cannabis/2023/000156
RethinkTHC
RethinkTHC Research Database. "A Latent Variable Analysis of Psychomotor and Neurocognitive..." RTHC-04951. Retrieved from https://rethinkthc.com/research/smith-2023-a-latent-variable-analysis
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.