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Aberrant interhemispheric functional and structural connectivity in heroin-dependent individuals.

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Heroin addiction impairs brain connectivity between hemispheres, particularly in areas controlling cognitive functions. Reduced corpus callosum (CC) volume and interhemispheric coordination correlate with addiction severity and impulsivity.

Keywords:
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Area of Science:

  • Neuroscience
  • Addiction Research
  • Neuroimaging

Background:

  • Heroin addiction models often focus on frontostriatal circuitry and cognitive control.
  • Interhemispheric functional and structural brain alterations in heroin addiction are understudied.
  • Resting-state fMRI and corpus callosum (CC) volume offer insights into brain connectivity.

Purpose of the Study:

  • To investigate interhemispheric functional connectivity (VMHC) and structural integrity (CC volume) in individuals with heroin dependence.
  • To explore the relationship between these connectivity measures, duration of heroin abuse, and impulsivity.

Main Methods:

  • Compared voxel-mirrored homotopic connectivity (VMHC) and CC volume using fMRI in 45 heroin-dependent individuals (HDIs) and 35 controls.
  • Correlated connectivity measures with heroin duration and impulsivity traits within the HDI group.
  • Examined mediation effects of VMHC on the relationship between CC volume and impulsivity.

Main Results:

  • HDIs showed reduced VMHC in striatum/limbic regions and decreased CC volume (splenium and genu).
  • Reduced VMHC in prefrontal cortex and putamen, and reduced CC volume, correlated negatively with heroin duration and impulsivity.
  • Impaired VMHC in the dorsal lateral prefrontal cortex partially mediated the link between reduced CC volume and increased impulsivity.

Conclusions:

  • Heroin dependence is associated with significant impairments in interhemispheric coordination.
  • Interhemispheric connectivity deficits are linked to addiction duration and impulsivity.
  • Findings support an integrative view of heroin addiction pathophysiology involving disrupted brain structural and functional organization.