Motivation to bully is regulated by brain reward circuits. Individual differences in the motivation to engage in or to avoid aggressive social interaction (bullying) are mediated by the basal forebrain, lateral habenula circuit in the brain

See the source article by following the link below:
Motivation to bully is regulated by brain reward circuits. Individual differences in the motivation to engage in or to avoid aggressive social interaction (bullying) are mediated by the basal forebrain, lateral habenula circuit in the brain