New research published in Molecular Psychiatry suggests that two major personality traits associated with alcohol use—impulsivity and neuroticism—stem from largely distinct brain networks. While both traits heighten the risk for problematic drinking in adolescents, the biological pathways driving that risk appear to be different. This finding supports the concept that there are multiple neurological routes that can lead to similar risky behaviors in youth. Impulsivity and neuroticism are well-known psychological risk factors for substance abuse, yet it remains unclear how these traits manifest in the brain’s complex wiring. Previous studies often focused on isolated brain regions rather than the broad communication patterns across the entire brain. The research team aimed to determine whether these two personality traits share a common neural foundation or if they operate through separate mechanisms. By mapping these connections, the scientists hoped to clarify how different vulnerabilities contribute to the onset of alcohol use during the critical developmental period of adolescence. “We are interested in understanding how risk factors in adolescence contribute to substance use problems later in life,” explained study …