Inhibitory-control event-related potentials correlate with individual differences in alcohol use

Area of Science:

• Neuroscience
• Psychology
• Addiction Research

Background:

• Impulsivity is a key factor in alcohol use, abuse, and dependence.
• Inhibitory control, a facet of impulsivity, is assessed via the stop-signal task (SST) using behavioral (stop-signal reaction time, SSRT) and electrophysiological (event-related potentials, ERPs) measures.
• Previous research on the link between alcohol use and inhibitory control measures is inconsistent.

Purpose of the Study:

• To investigate the relationship between individual differences in alcohol use and measures of impulsivity, specifically inhibitory control.
• To determine the predictive power of electrophysiological (ERPs) and behavioral measures of inhibitory control on alcohol use.

Main Methods:

• Adult alcohol users (n=79) completed the SST under electroencephalography (EEG).
• Alcohol use was assessed using the Alcohol Use Disorders Identification Test (AUDIT).
• Machine learning with penalized linear regression and out-of-sample validation was employed to correlate alcohol use with impulsivity measures (ERPs, SSRT, Stroop interference).

Main Results:

• Event-related potentials (ERPs) alone statistically predicted alcohol use (cross-validated r=0.28), with both early (N2) and late (P3) components contributing.
• Behavioral impulsivity measures, particularly the Stroop interference effect, were also associated with alcohol use (r=0.37), while SSRT was a weaker predictor.
• Combining ERPs with non-ERP behavioral data did not significantly improve the prediction of alcohol use.

Conclusions:

• Inhibitory control as measured by event-related potentials (ERPs) demonstrates a robust correlation with individual differences in alcohol use.
• Electrophysiological measures of inhibitory control provide valuable insights into the neurobiological underpinnings of alcohol use patterns.