P300 Marker of Emotional Attention Bias in Health-Risk Smoking Behaviors: The Specific and Distinct Roles of ASPD and Moral Identity

Introduction The relationship between antisocial personality disorder (ASPD), moral identity, and health-risk behaviors such as smoking in young adults reflects a complex psychosocial and neurobiological construct. This study aimed to (1) examine the predictive roles of ASPD traits and moral identity in emotional attention bias toward health-risk smoking behaviors (Model 1) and non-health risk behaviors (Model 2), and (2) investigate whether moral identity moderates the association between ASPD traits and emotional attention bias for these behaviors (Partial Correlation Models 1 and 2). Methods Twenty-one participants (mean age = 22 years) meeting eligibility criteria were recruited. Brain activity associated with attentional bias was measured using event-related potentials (ERPs). Participants viewed visual stimuli representing smoking-related behaviors, non-health risk behaviors, and neutral content, while P300 brain potentials were extracted following standard procedures at central-parietal regions. Results Moral symbolization explained 24% of the variance in attentional bias toward smoking-related stimuli in Model 1 and 26% of the variance in attention to non-health risk behaviors in Model 2, as reflected by P300 amplitude. Moral internalization significantly moderated the relationship between impulsivity and attention bias toward smoking stimuli, as indicated by P300 latency ( p = 0.03). Callous-unemotional traits were also significantly associated with attentional bias for smoking-related behaviors, influenced by moral internalization ( p = 0.03). Discussion Findings indicate that moral symbolization robustly predicts attentional responses to both risky and non-risky cues, while moral internalization buffers impulsivity and callous-unemotional traits in shaping smoking-related biases. These results highlight the neurocognitive role of moral identity in regulating risky attentional patterns, extending prior research on moral–emotional regulation. Conclusion Strengthening moral identity could serve as an intervention strategy to reduce attentional biases toward health-risk behaviors, supporting the development of targeted programs for healthier decision-making. Replication with larger, more diverse samples is warranted.