Research finding · February 2026
Differences in brain-based decision-making and impulse control can shape suicide risk
When we think about suicide risk, we often focus on emotional pain, depression, or moments of acute crisis. But another important part of the picture involves how people make decisions under stress. A growing body of research shows that some individuals who attempt suicide have persistent difficulties weighing long-term consequences, learning from past experiences, and inhibiting impulsive responses, even outside of crisis periods. These challenges are not about poor judgment or character. Rather, they reflect differences in how the brain integrates emotion, reward, and self-control, particularly when emotions run high. Understanding these cognitive vulnerabilities helps explain why suicide risk can persist over time and why moments of distress may escalate more quickly for some people than for others.
With support from their linked AFSP-funded grant, Dr. Gerd Wagner and Dr. Fabrice Jollant examined brain connectivity in 48 adults with a history of suicide attempts, comparing them with psychiatric patient comparison group who had depression but no history of attempts, and non-psychiatric controls. Using advanced brain imaging, the team focused on brain pathways that support decision-making and inhibition, especially connections linking reward-related and behavioral control-related brain regions. People with a history of suicide attempts showed distinct differences in these pathways, particularly in circuits involved in evaluating situational risk and future outcomes. These structural differences were related to performance on a decision-making task that measures the ability to learn from consequences over time. Individuals who had used more violent suicide methods showed more pronounced differences in the same pathways, suggesting that different patterns of suicidal behavior may be associated with different levels of cognitive vulnerability. Importantly, the researchers do not suggest that brain differences alone cause suicidal behavior. Instead, they suggest that enduring differences in decision-making and inhibitory systems may interact with emotional distress, making it harder to pause, reassess, or choose safer alternatives during moments of crisis. These findings underscore the value of prevention and treatment approaches that address not only emotional suffering, but also decision-making processes and impulse control as part of comprehensive suicide prevention efforts.
Citation: Gerd Wagner, Ani Zerekidze, Meng Li et al. White Matter Microstructural Alterations and their Association with Decision-Making Deficits in Suicide Attempters, 31 December 2025, PREPRINT (Version 1) available at Research Square https://doi.org/10.21203/rs.3.rs-8194143/v1
This finding comes from an AFSP-funded study — see the grant below ↓
