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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
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Regular cannabis use modulates gamma functional connectivity with V1 during visual processing.

Lauren K Webert1, Nathan M Petro1, Seth D Springer2

  • 1Institute for Human Neuroscience, Boys Town National Research Hospital, 14090 Mother Teresa Ln, Boys Town, NE 68101, USA.

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Summary
This summary is machine-generated.

Heavy cannabis use impacts cognitive function by altering neural activity. This study found that while basic gamma brainwave circuits remain intact, functional connectivity in cannabis users is affected, potentially explaining cognitive deficits.

Keywords:
EntrainmentHashMEGMagnetoencephalographyMarijuanaVisual cortex

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Heavy cannabis use is linked to cognitive deficits.
  • Cannabis affects endocannabinoid receptors, impacting neural networks crucial for gamma-band responses.
  • Previous research focused on higher-order processing, neglecting fundamental gamma circuit integrity.

Purpose of the Study:

  • To investigate the effects of heavy cannabis use on basic gamma circuit integrity and functional connectivity.
  • To examine gamma-band responses in visual cortices during a visual entrainment task in regular cannabis users and nonusers.

Main Methods:

  • High-density magnetoencephalography (MEG) was used on 84 regular cannabis users and 90 demographically-matched nonusers.
  • Participants underwent a visual entrainment task with gamma-band flicker frequencies (32, 40, and 48 Hz).
  • Time-frequency analysis and dynamic functional connectivity were computed to assess neural activity and network interactions.

Main Results:

  • Strong gamma entrainment was observed in bilateral primary visual cortices (V1), with 32 Hz responses being the strongest.
  • Right V1 activity was stronger than left V1 activity across groups and frequencies.
  • The cannabis group showed elevated 32 Hz functional connectivity between V1 and higher-order visual regions compared to controls.

Conclusions:

  • Basic gamma circuitry appears intact in individuals with heavy cannabis use.
  • Heavy cannabis use preferentially affects gamma functional connectivity, particularly between primary and higher-order visual areas.
  • Altered gamma functional connectivity may underlie the observed higher-order cognitive deficits associated with cannabis use.