P300 Predicts the Effect of a Brief Intervention on Alcohol Consumption in Habitual Drinkers

Background This study investigated whether P300, a component of event-related potentials (ERPs), and cognitive performance related to frontal lobe function can predict responsiveness to a brief cognitive behavioral intervention in individuals who consume alcohol on ≥3 days per week. Methods Participants were 35 habitual drinkers (drinking alcohol on ≥3 days per week). At baseline, they completed self-report questionnaires assessing alcohol consumption, neuropsychological tests reflecting frontal lobe function (eg, the Trail Making Test, Stroop Test, Digit Symbol Substitution Test, verbal fluency tests), and P300 assessment during a visual oddball task with alcohol-related images. All participants then received ∼30 min of structured counseling on drinking behavior, followed by a second brief intervention at 3 months. Alcohol intake was reported at both time points, and total daily alcohol consumption (in standard drinks) was calculated. Participants were categorized as successful reducers if their daily alcohol intake at three months was lower than at baseline (n = 27), and as unsuccessful if intake was unchanged or increased (n = 8). Baseline ERP and neuropsychological measures were compared between groups. Results Participants who reduced their drinking had significantly lower P300 amplitudes at P3 and Fz at baseline compared with those who did not. No significant between-group differences were found in neuropsychological performance. Conclusions Lower P300 amplitudes may serve as a neurophysiological marker for predicting responsiveness to brief psychosocial interventions for alcohol reduction in individuals with high-risk drinking, potentially providing greater sensitivity than traditional neuropsychological tests.