NEW YORK: It has been well documented that, across human cultures and in most mammals, males are more aggressive than females. It's simple to blame male hormones but a new study has found the role of brain in the behaviour. A team of researchers at the Vanderbilt University in the United States has carried out the study and found it is the human brain which processes aggression as a reward much like sex, food and drugs. "We have found that the 'reward pathway' in the brain becomes engaged in response to an aggressive event and that dopamine is involved. "It's...