RESUMEN

Background: Positive and negative alcohol expectancies (PAEs and NAEs, respectively) and impulsivity are key risk factors for the onset of alcohol use. While both factors independently contribute to alcohol initiation, the developmental aspects of AEs and their nuanced relationship with impulsivity are not adequately understood. Understanding these relationships is imperative for developing targeted interventions to prevent or delay alcohol use onset in youth. Methods: This study utilized the Adolescent Brain Cognitive Development cohort to examine how PAEs and NAEs develop over time and relate to each other. We also explored how self-reported and behavioral impulsivity at baseline (~10 years old) are associated with the longitudinal development of PAEs and NAEs in youth Ages 11, 12, and 13 (n = 7493; 7500; and 6981, respectively), as well as their time-specific relationships. Results: Findings revealed while PAEs increased steadily over all three years, NAEs increased from ages 11-12 and then remained unchanged between 12 and 13. Overall, PAEs and NAEs were inversely related. Moreover, PAEs positively correlated with sensation seeking and lack of premeditation, while NAEs negatively correlated with positive urgency. Interestingly, a time-specific association was observed with PAEs and lack of perseverance, with a stronger correlation to PAEs at Age 11 compared to Age 12. Conclusions: Overall, this study provides valuable insights into the divergent developmental trajectory of PAEs and NAEs, and their overall and time-specific associations with impulsivity. These findings may guide focused and time-sensitive prevention and intervention initiatives, aiming to modify AEs and reduce underage drinking.