Scientists have uncovered the brain structure that could reveal whether someone is a cold-blooded killer.
Researchers scanned the brains of 37 murderers while they were awaiting trial, and found that they all had a critical difference in a part of the brain called the amygdala.
This small structure is located deep within the brain, and plays a vital role in processing emotions, recognising fear, and making moral decisions.
But in the brains of confirmed killers, this vital structure was almost six per cent smaller than in the general population.
Even more strikingly, scientists believe that these brain scans can reveal the difference between cold-blooded murderers and those who kill in the moment.
