In Bandura's Bobo doll study, sixty-six nursery children were divided into three groups. They watched a video of an adult being violent towards a bobo doll. The role model was either rewarded, punished or nothing happened for that behaviour. The children who watched the aggressive model showed more violence overall. Those who saw the model be punished were less likely to imitate. Seeing the same sex model increased the likelihood. Boys imitated more aggressive behaviour overall