A neuroimaging study has found that youth with more pronounced callous-unemotional personality traits tend to have higher gray matter volume and surface area in the anterior cingulate cortex region of the brain. But no associations between aggression and brain structure were found. The research was published in Scientific Reports. Since the dawn of time, humans have been killing each other. Estimates state that around 1.6 million people die each year as a result of violence. While proneness to violence is a complex phenomenon, studies have identified specific risk factors that increase the lik…