Chronic Cannabis Users Had Reduced Ability to Notice Their Own Errors
Active chronic cannabis users showed significantly impaired awareness of their own mistakes, associated with reduced activity in brain regions critical for error monitoring.
Quick Facts
What This Study Found
Sixteen active chronic cannabis users and 16 controls performed a Go/No-go response inhibition task during fMRI scanning. The task measured both the ability to stop a response (inhibitory control) and awareness of errors when they occurred.
Cannabis users performed equally well at inhibiting responses, but they showed a significant deficit in awareness of their own commission errors.
This reduced error awareness was associated with reduced activity (hypoactivity) in the anterior cingulate cortex (ACC) and right insula, two brain regions critical for monitoring behavior and interoceptive awareness.
Increased hypoactivity in both regions significantly correlated with error awareness rates in the cannabis group but not in controls.
Key Numbers
16 cannabis users and 16 controls. Inhibitory control was equivalent between groups. Error awareness was significantly reduced in cannabis users. ACC and right insula hypoactivity correlated with error awareness deficits in the cannabis group.
How They Did This
Cross-sectional fMRI study comparing 16 active chronic cannabis users to 16 matched controls. Participants performed a Go/No-go task that separately measured inhibitory control and error awareness. Brain activation was measured with event-related fMRI.
Why This Research Matters
Error awareness is fundamental to self-monitoring and behavior change. A reduced capacity to notice mistakes could contribute to continued problematic behavior patterns, including ongoing drug use.
The Bigger Picture
Diminished error awareness has been linked to loss of insight, delusions, and perseverative behavior in other psychiatric conditions. This finding suggests chronic cannabis use may affect the brain circuits underlying self-awareness and self-correction.
What This Study Doesn't Tell Us
Small sample (16 per group). Cross-sectional design cannot determine whether reduced error awareness preceded cannabis use or resulted from it. Participants were active users, so acute intoxication effects cannot be fully separated from chronic effects.
Questions This Raises
- ?Does error awareness recover with cannabis abstinence?
- ?Could impaired error awareness predict who develops problematic cannabis use?
- ?Is the effect specific to cannabis or common across substance use?
Trust & Context
- Key Stat:
- Cannabis users showed equivalent impulse control but significantly impaired error awareness
- Evidence Grade:
- Small cross-sectional fMRI study (16 per group) that cannot establish causation or rule out pre-existing differences.
- Study Age:
- Published in 2009. Subsequent research has further explored cognitive monitoring deficits in cannabis users, generally supporting the finding of impaired metacognitive awareness.
- Original Title:
- Impaired error awareness and anterior cingulate cortex hypoactivity in chronic cannabis users.
- Published In:
- Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 34(11), 2450-8 (2009)
- Authors:
- Hester, Robert(4), Nestor, Liam(5), Garavan, Hugh(22)
- Database ID:
- RTHC-00358
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
What is error awareness and why does it matter?
Error awareness is the ability to notice when you have made a mistake. It is essential for learning from errors, adjusting behavior, and maintaining insight into your own performance. Reduced error awareness could make it harder to recognize problematic patterns in your own behavior.
Could this be why some people do not think cannabis affects them?
Possibly. If cannabis use reduces the brain systems responsible for noticing errors and monitoring behavior, users might genuinely be less aware of changes in their own performance, creating a disconnect between actual and perceived functioning.
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Cite This Study
https://rethinkthc.com/research/RTHC-00358APA
Hester, Robert; Nestor, Liam; Garavan, Hugh. (2009). Impaired error awareness and anterior cingulate cortex hypoactivity in chronic cannabis users.. Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 34(11), 2450-8. https://doi.org/10.1038/npp.2009.67
MLA
Hester, Robert, et al. "Impaired error awareness and anterior cingulate cortex hypoactivity in chronic cannabis users.." Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2009. https://doi.org/10.1038/npp.2009.67
RethinkTHC
RethinkTHC Research Database. "Impaired error awareness and anterior cingulate cortex hypoa..." RTHC-00358. Retrieved from https://rethinkthc.com/research/hester-2009-impaired-error-awareness-and
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.