Bad Born – or Just Slapped?
Recent research indicates that damage to key brain areas related to judgment and emotional control might explain why certain individuals suddenly display violent or criminal tendencies. This study is consistent with earlier findings that show head trauma is more prevalent among the prison population in the United States compared to the general public.
“This work can have real-world impacts on both medicine and law,” stated Dr. Christopher M. Philly, a Neurology Professor Emeritus at the University of Colorado School of Medicine and co-author of the research. He added that practitioners might be able to identify at-risk patients better and implement effective early interventions. Furthermore, courts may need to take brain damage into account when evaluating criminal responsibility.
The research team examined brain scans from 17 individuals who began to exhibit criminal behavior following head injuries from strokes, tumors, or traumatic brain injuries (TBI). They compared these scans with over 700 others from people with various neurological issues, like memory loss and depression.
Findings revealed that a specific area on the right side of the brain, identified as the Uncinate Fasciculus, was commonly injured in those involved in criminal activities. Dr. Philly explained that this white matter pathway is crucial for emotional regulation and decision-making. Damage to this part can severely impair a person’s ability to manage emotions and make ethical decisions.
Previous studies have shown that individuals with a history of traumatic brain injuries often face challenges such as depression, drug abuse, aggression, and antisocial behavior. Additionally, even after cognitive recovery, they may struggle with self-control and inappropriate thoughts and actions.
According to a report from the Centers for Disease Control and Prevention, an estimated 25% to 87% of inmates in US prisons have experienced head trauma or TBI, compared to only 8.5% of the general population. Research suggests that the incarcerated demographic is likely to include many with moderate to severe TBI, often stemming from incidents that occurred before their first crime.
As a result, an increasing number of attorneys are arguing in court that brain injuries contribute to their clients’ criminal behaviors. Judge Morris B. Hoffman from the Second Judicial District Court in Colorado remarked that the frequency of these cases is on the rise. Between 2005 and 2015, more than 2,800 legal references were made where US defendants utilized neuroscience in their defense, with about 20% achieving favorable outcomes, like a new hearing or an extended timeline for legal filings.
These new insights into damage to the right side of the brain may further inform these discussions. Dr. Isaiah Kretnik, Assistant Professor of Neurology at Harvard Medical School and lead author of the study, emphasized that while brain damage is commonly associated with memory and motor function issues, its impact on social behaviors and crime remains contentious. He raised important ethical questions about how brain damage relates to criminal accountability, suggesting that while scientific causality differs from legal negligence, the findings provide valuable data to widen the discussion and deepen the understanding of how brain function mediates social behavior.
