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Jodi M Gilman1, Max T Curran2, Vanessa Calderon2

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Young adults using marijuana showed different brain activity during social exclusion compared to non-users. This suggests altered neural processing of peer interactions in marijuana users.

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Area of Science:

  • Neuroscience
  • Psychology
  • Addiction Research

Background:

  • Peer influence is a significant factor in adolescent and young adult marijuana use.
  • Neural mechanisms underlying social processing in marijuana users remain understudied.

Purpose of the Study:

  • To investigate the neural correlates of social exclusion in young adults who use marijuana compared to non-users.
  • To explore potential differences in brain activation patterns during social exclusion tasks.

Main Methods:

  • Utilized the Cyberball game, a neuroimaging social exclusion task.
  • Compared brain activity (fMRI) in marijuana users (n=20) and non-using controls (n=22) during social exclusion.
  • Assessed insula and ventral anterior cingulate cortex (vACC) activation.

Main Results:

  • Controls showed significant insula activation during exclusion; marijuana users did not.
  • Both groups exhibited vACC activation during peer exclusion.
  • Marijuana users displayed a correlation between vACC activation and peer conformity scores.

Conclusions:

  • Marijuana users exhibit atypical neural processing of social exclusion.
  • These neural differences may be a consequence of or contribute to regular marijuana use.
  • Findings highlight potential alterations in social cognition associated with marijuana consumption.