Cannabis Users Show Greater Brain Response to Peer Information and More Effort When Disagreeing with Peers
Young adult cannabis users showed increased caudate activation when receiving peer information and took longer to make decisions that went against the group, suggesting heightened neural sensitivity to social influence.
Quick Facts
What This Study Found
This companion study to RTHC-01164 used a slightly different social influence paradigm with 20 cannabis-using young adults and 23 controls. Participants made perceptual choices after seeing what their peers chose.
Behaviorally, cannabis users and controls followed or opposed the group at similar rates. But cannabis users showed significantly longer reaction times when deciding to go against the group, suggesting they had to exert more cognitive effort to resist conformity.
The brain imaging revealed that cannabis users had significantly greater caudate activation when presented with peer information compared to controls. Across both groups, caudate activation correlated with self-reported susceptibility to influence. The longer reaction times when opposing the group were associated with greater frontal brain activation.
Key Numbers
Twenty cannabis users vs. 23 controls. No behavioral difference in conformity rates, but cannabis users had slower reaction times when opposing group choices. Greater caudate activation to peer information in cannabis users. Caudate activation correlated with self-reported susceptibility to influence across groups.
How They Did This
Cross-sectional fMRI study comparing 20 marijuana-using young adults with 23 controls. Participants viewed photographs of peers and their choices in a perceptual decision task during functional MRI scanning. Reaction times and brain activation were analyzed in relation to social conformity and resistance.
Why This Research Matters
This study complements the findings of RTHC-01164 by showing that cannabis users are not simply more conformist, but rather that processing social information appears to require more neural resources for them. The reaction time data suggests that going against peers is cognitively more effortful for cannabis users, even when they ultimately make independent choices.
The Bigger Picture
Together with RTHC-01164, these findings suggest that cannabis use is associated with a broader pattern of heightened neural sensitivity to social information. This goes beyond simple peer pressure and touches on fundamental differences in how cannabis users process social cues and make decisions in social contexts.
What This Study Doesn't Tell Us
Cross-sectional design cannot establish causality. The small sample size limits statistical power. Peers were unknown to participants, which may reduce the ecological validity of the social influence manipulation. Self-reported cannabis use.
Questions This Raises
- ?Is the heightened neural response to social information a trait that predisposes people to cannabis use, or does cannabis use change the brain's social processing?
- ?Would this heightened sensitivity be seen with other social tasks beyond perceptual decisions?
Trust & Context
- Key Stat:
- Cannabis users took longer to disagree with peers and showed greater caudate response to social cues
- Evidence Grade:
- Well-designed fMRI study with appropriate sample size and controls, but cross-sectional design and small groups limit generalizability.
- Study Age:
- Published in 2016. This line of research on social neuroscience and substance use continues to develop.
- Original Title:
- Neural mechanisms of sensitivity to peer information in young adult cannabis users.
- Published In:
- Cognitive, affective & behavioral neuroscience, 16(4), 646-61 (2016)
- Authors:
- Gilman, Jodi M(10), Schuster, Randi M(9), Curran, Max T, Calderon, Vanessa, van der Kouwe, Andre, Evins, A Eden
- Database ID:
- RTHC-01165
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Are cannabis users more easily influenced by peers?
They did not conform more often in this study, but their brains responded more strongly to peer information and they took longer to make decisions opposing the group, suggesting social influence requires more cognitive processing for them.
How does this relate to cannabis prevention?
Understanding that cannabis users show heightened neural sensitivity to social information could help design prevention programs that address the specific ways social influence operates in this population.
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Cite This Study
https://rethinkthc.com/research/RTHC-01165APA
Gilman, Jodi M; Schuster, Randi M; Curran, Max T; Calderon, Vanessa; van der Kouwe, Andre; Evins, A Eden. (2016). Neural mechanisms of sensitivity to peer information in young adult cannabis users.. Cognitive, affective & behavioral neuroscience, 16(4), 646-61. https://doi.org/10.3758/s13415-016-0421-8
MLA
Gilman, Jodi M, et al. "Neural mechanisms of sensitivity to peer information in young adult cannabis users.." Cognitive, 2016. https://doi.org/10.3758/s13415-016-0421-8
RethinkTHC
RethinkTHC Research Database. "Neural mechanisms of sensitivity to peer information in youn..." RTHC-01165. Retrieved from https://rethinkthc.com/research/gilman-2016-neural-mechanisms-of-sensitivity
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.