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Chronic Cannabis users exhibit altered oscillatory dynamics and functional connectivity serving visuospatial

Camilo A Castelblanco1,2,3, Seth D Springer1,4, Mikki Schantell1,4

  • 1Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE, USA.

Journal of Psychopharmacology (Oxford, England)
|August 1, 2024
PubMed
Summary
This summary is machine-generated.

Chronic cannabis use alters brain activity in visual and attention networks. Regular users show weaker theta and gamma oscillations and reduced alpha connectivity, impacting visuospatial processing.

Keywords:
CBDMarijuanaalphaattentiongammamagnetoencephalographytheta

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychopharmacology

Background:

  • Cannabis is a widely used psychoactive substance.
  • Acute cannabis use impacts cognitive functions like attention.
  • Chronic use effects on neural dynamics of attention are less understood.

Purpose of the Study:

  • Investigate chronic cannabis use effects on neural dynamics of visuospatial processing.
  • Compare brain activity in regular cannabis users versus non-users.
  • Examine alterations in neuronal oscillations and connectivity.

Main Methods:

  • Used magnetoencephalography (MEG) to record brain activity during a visuospatial task.
  • Recruited 44 regular cannabis users and 53 non-user controls.
  • Analyzed time-frequency resolved neural responses for group differences.

Main Results:

  • Cannabis users showed weaker theta oscillations (occipital, cerebellar) and gamma responses (left temporal).
  • Alpha oscillations did not differ, but alpha connectivity was reduced in users.
  • Reduced alpha connectivity correlated with performance in cannabis users.

Conclusions:

  • Chronic cannabis use alters oscillatory dynamics and neural connectivity in visuospatial attention.
  • Observed alterations may indicate compensatory mechanisms or early aberrant neural activity.
  • Further research is needed to understand the implications of these neurophysiological changes.