Brain Morphology in Mass Murderers: An In-Depth Exploration
Brain Morphology in Mass Murderers: An In-Depth Exploration

Summary/Abstract: Mass murderers often exhibit extreme violent behavior, prompting questions about the neurobiological factors contributing to such actions. This review examines the brain morphology of mass murderers, focusing on structural and functional abnormalities in brain regions involved in aggression, decision-making, and emotional regulation. Neuroimaging studies indicate that mass murderers commonly show dysfunction in key areas, including the prefrontal cortex (PFC), amygdala, orbitofrontal cortex (OFC), and hippocampus regions essential for impulse control, emotional processing, and moral decision-making. Reduced activity and structural abnormalities in the PFC and amygdala impair emotional regulation, empathy, and impulse control, while dysfunction in the OFC contributes to poor decision-making and risk assessment. Furthermore, imbalances in neurotransmitter systems, such as serotonin, dopamine, and norepinephrine, amplify aggression and impulsivity. These neurobiological factors, combined with environmental influences like trauma, suggest that mass murderers may be predisposed to violent behavior due to a complex interplay of brain abnormalities and life experiences. While no single factor can fully explain mass murder, this review highlights the importance of understanding the neuroanatomical underpinnings of violent behavior for developing effective prevention and intervention strategies. Such findings could be useful in the context of the etiology of crime, providing a better understanding of the biological roots of crime, which further influences the improvement of dealing with perpetrators of mass murders in the prison system through the rehabilitation process, despite numerous limitations. Understanding brain morphology in mass murderers is also important from the perspective of criminal law practice, which forms part of the broader connection between criminal law and neuroscience.

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