The Bobo doll study by Bandura took 36 boys and 36 girls aged 3-6 and were put into a room one at a time and exposed to an adult's behaviour. There were 3 conditions: aggression towards the doll, no aggression and no model (control). They were then allowed to play and their behaviour was observed. Those who had observed aggressive behaviour were more aggressive, especially boys. And there was a greater level of imitation if the role model was the same gender as the child