Topic: Neuroscience

Scientists used brain scans to find a surprising difference between people with psychopathic traits and those without. The study found that a part of the brain involved in rewards and motivation was larger in psychopaths.

Psychopathy is often linked to antisocial behavior, but what drives this behavior? Researchers from Nanyang Technological University, Singapore, the University of Pennsylvania, and California State University wanted to find out. They used magnetic resonance imaging (MRI) scans to study the brains of 120 people in the United States. The team found that a brain region called the striatum was about 10 percent larger on average in individuals with psychopathic traits compared to those without.

The striatum is part of the basal ganglia, which plays a role in movement planning, decision-making, motivation, and how our brains respond to rewards. People with strong psychopathic traits often show reduced empathy, little remorse for harmful actions, and may be more likely to engage in criminal behavior.

This study helps us understand what underlies antisocial behavior like psychopathy. The findings suggest that biology, including the size of brain structures, can contribute to antisocial and criminal behavior.

Why It Matters

Understanding what drives psychopathic traits can help us develop better approaches to preventing and treating this condition. As a society, we need to consider both social environmental influences and biological factors when trying to address antisocial behavior.

Key Facts

• The striatum was about 10 percent larger on average in individuals with psychopathic traits compared to those without.
• Psychopathy is often linked to antisocial behavior, including reduced empathy and a greater likelihood of criminal behavior.
• The study involved MRI scans of 120 people in the United States and used the Psychopathy Checklist -- Revised to assess psychopathic traits.

Key Terms

Striatum

A part of the brain involved in rewards, motivation, and movement planning

Implications

Understanding what drives psychopathic traits can help us develop better approaches to preventing and treating this condition. As a society, we need to consider both social environmental influences and biological factors when trying to address antisocial behavior.