Abnormal fronto-striatal intrinsic connectivity reflects executive dysfunction in alcohol use disorders

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Alcohol use disorders (AUDs) are associated with cognitive impairments, but the underlying neural mechanisms remain debated.
• Explanations range from specific frontal lobe damage to global brain dysfunction.
• Resting-state brain activity offers insights into intrinsic functional connectivity relevant to cognitive performance.

Purpose of the Study:

• To investigate the neural bases of cognitive impairments in AUD patients.
• To explore the relationship between resting-state brain activity, functional connectivity, and executive functions in AUD.
• To compare brain activity and connectivity in AUD patients versus healthy controls.

Main Methods:

• Coupled resting-state functional magnetic resonance imaging (fMRI) with comprehensive neuropsychological assessments.
• Analyzed intrinsic brain activity intensity and functional network connectivity.
• Compared 22 AUD patients with 18 healthy controls.

Main Results:

• AUD patients exhibited executive dysfunction, particularly in attentional and working-memory tasks.
• Cognitive impairment in AUD correlated with altered intrinsic activity in the executive control network (dorsolateral prefrontal cortex, striatum).
• Functional connectivity between these executive control network nodes was reduced in AUD patients compared to controls.

Conclusions:

• Executive impairment in AUD stems from dysfunctional connectivity within the cortical-subcortical networks governing cognitive control.
• These findings highlight abnormal neural architecture in AUD and provide a baseline for treatment outcome studies.