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Related Experiment Video

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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
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Aberrant structural-functional coupling in adult cannabis users.

Dae-Jin Kim1, Ashley M Schnakenberg Martin1, Yong-Wook Shin2

  • 1Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana.

Human Brain Mapping
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Summary

Cannabis use disrupts the brain

Keywords:
cannabisconnectomefunctional connectivitystructural connectivitystructural-functional coupling

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Cannabis Research

Background:

  • Endocannabinoid type-1 signaling is crucial for synaptic plasticity.
  • Delta-9-tetrahydrocannabinol (THC) from cannabis (CB) may alter brain connectivity.
  • Understanding CB's impact on brain networks is vital.

Purpose of the Study:

  • To investigate alterations in structural and functional brain connectivity in CB users.
  • To examine the association between structural-functional connectivity coupling and network properties.
  • To assess rich-club organization and its relation to CB use.

Main Methods:

  • Diffusion tensor imaging (DTI) and resting-state functional MRI (rs-fMRI) were used.
  • Graph theory analyzed structural and functional brain networks.
  • 37 current CB users and 31 healthy non-users participated.

Main Results:

  • Structural-functional connectivity (SC-FC) coupling was globally preserved but disrupted in its association with network topology in CB users.
  • Disruptions were most pronounced in shorter brain connections, indicating region-specific effects.
  • Impaired SC-FC coupling was observed in the hippocampus and caudate, areas rich in CB1 receptors.

Conclusions:

  • Cannabis use is associated with abnormal structural-functional connectivity associations in the brain.
  • The effects are prominent in local brain interconnections and specific regions like the hippocampus and caudate.
  • Findings suggest potential impacts on learning and habit formation due to chronic cannabis use.