Altered resting-state connectivity in adolescent cannabis users.

Area of Science:

• Neuroscience
• Adolescent development
• Substance use research

Background:

• Cannabis is the most prevalent illicit drug among adolescents.
• Heavy cannabis use is associated with cognitive deficits and potential impacts on brain development.
• Adolescence is a critical period for brain maturation, making it vulnerable to substance-related effects.

Purpose of the Study:

• To investigate differences in intrinsic brain activity and connectivity in adolescents with cannabis dependence.
• To utilize whole-brain voxelwise approaches to analyze resting-state brain function.
• To compare brain activity patterns between cannabis-dependent adolescents and age-matched controls.

Main Methods:

• Recruited adolescents with cannabis dependence (n=17) and healthy controls (n=18).
• Measured fractional amplitude of low-frequency fluctuations (fALFF) to assess intrinsic brain activity.
• Analyzed interhemispheric resting-state functional connectivity (RSFC) using voxel-mirrored homotopic connectivity.

Main Results:

• Adolescents with cannabis dependence exhibited increased fALFF in several right hemisphere regions.
• Stronger intra-hemispheric functional connectivity was observed in cannabis-dependent adolescents within specific regions.
• Reduced interhemispheric connectivity was noted in cannabis users in the cerebellum and superior frontal gyrus.

Conclusions:

• Reduced interhemispheric resting-state functional connectivity in adolescent cannabis users aligns with findings of white matter deficits.
• Elevated intra-hemispheric connectivity may indicate a compensatory mechanism in the adolescent brain.
• Altered intrinsic brain connectivity appears to be a characteristic feature of adolescent cannabis dependence.