Based on fMRI data, psychopaths experience decreased neural activity in paralimbic regions of the brain. This is interesting because those areas are important for moral reasoning, affective memory, and inhibition — all of which are challenges faced by psychopaths. Further experiments showed that the psychopathic brain is deficient in areas important for moral judgment. More specifically:

• recognizing moral issues;
• inhibiting a response before the issue is resolved;
• making a decision about moral issue.