Cannabis users showed heightened brain reward response to money but reduced sensitivity to losses
Chronic cannabis users showed increased ventral striatum activity when anticipating monetary rewards and reduced insula response to losses compared to non-users.
Quick Facts
What This Study Found
Fourteen chronic cannabis users and 14 non-using controls completed a monetary incentive delay task during fMRI brain scanning. Despite no behavioral performance differences, cannabis users showed significantly greater right ventral striatum (reward center) activation when anticipating rewards.
This heightened reward anticipation response correlated significantly with lifetime cannabis use and total joints consumed. No correlations with abstinence duration were found.
Cannabis users also showed reduced left insula activation in response to loss and loss avoidance outcomes, suggesting diminished sensitivity to negative financial outcomes.
Key Numbers
14 cannabis users vs 14 controls. Reward anticipation: significantly greater right ventral striatum BOLD response in users, correlated with lifetime use. Loss outcomes: reduced left insula cortex activation in users.
How They Did This
Cross-sectional fMRI study comparing 14 chronic cannabis users to 14 drug-naive controls during a monetary incentive delay (MID) task measuring brain activation during reward and loss anticipation and outcome delivery.
Why This Research Matters
The findings suggested cannabis users may have a heightened sensitivity to rewards generally (not just drug rewards) while being less sensitive to losses, a pattern relevant to understanding risk-taking behavior and continued drug use.
The Bigger Picture
These results supported the opponent process theory of addiction over the reward deficiency syndrome model, suggesting cannabis users had heightened rather than blunted reward processing for non-drug incentives.
What This Study Doesn't Tell Us
Small sample size (14 per group). Cross-sectional design could not determine whether brain differences preceded or followed cannabis use. Cannabis users may differ from controls in ways beyond drug use.
Questions This Raises
- ?Does heightened reward sensitivity predispose people to cannabis use, or does cannabis use create this sensitivity?
- ?Would these brain patterns normalize with sustained abstinence?
Trust & Context
- Key Stat:
- Reward brain response correlated with lifetime cannabis joints consumed
- Evidence Grade:
- Small cross-sectional fMRI study (14 per group) showing associations but unable to establish causation.
- Study Age:
- Published in 2010. Neuroimaging research on cannabis and reward processing has expanded considerably since.
- Original Title:
- Increased ventral striatal BOLD activity during non-drug reward anticipation in cannabis users.
- Published In:
- NeuroImage, 49(1), 1133-43 (2010)
- Authors:
- Nestor, Liam(5), Hester, Robert(4), Garavan, Hugh(22)
- Database ID:
- RTHC-00438
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Does cannabis make people more motivated by rewards?
This study found cannabis users had greater brain activation when anticipating rewards, but could not determine whether cannabis caused this or whether reward-sensitive people were more likely to use cannabis.
What does reduced loss sensitivity mean?
Cannabis users showed less brain response to losing money. This pattern could contribute to risky decision-making, as the brain may not register negative outcomes as strongly.
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Cite This Study
https://rethinkthc.com/research/RTHC-00438APA
Nestor, Liam; Hester, Robert; Garavan, Hugh. (2010). Increased ventral striatal BOLD activity during non-drug reward anticipation in cannabis users.. NeuroImage, 49(1), 1133-43. https://doi.org/10.1016/j.neuroimage.2009.07.022
MLA
Nestor, Liam, et al. "Increased ventral striatal BOLD activity during non-drug reward anticipation in cannabis users.." NeuroImage, 2010. https://doi.org/10.1016/j.neuroimage.2009.07.022
RethinkTHC
RethinkTHC Research Database. "Increased ventral striatal BOLD activity during non-drug rew..." RTHC-00438. Retrieved from https://rethinkthc.com/research/nestor-2010-increased-ventral-striatal-bold
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.