There were 72 children in this study. 36 boys and 36 girls. They were all from Stanford University Nursery. All were aged 37-69 months.
3. Testing for delayed imitation
Each child was subject to a ten minute game in which either aggressive or non-aggressive behaviour which was modelled by a model of either the same or the opposite sex. 12 boys and 12 girls saw the aggressive model. Of the group, 6 boys and 6 girls saw same sex models and the rest saw models of the opposite sex. The same system was used for the non-aggressive model. A control group of 12 boys and 12 girls had no model.
To ensure the child was annoyed, they were put in a room with a 'special' toy that they were allowed to play with for two minutes before it was taken away from them because 'it was for a more special child'
The child was then put in a room with an observer, who busied themself with paperwork whilst a one way mirror separated two examiners from the child. The child was observed by a nursery teacher and by a psychologist and their aggression levels were measured using a scale of 0-5 for verbal, physical aggression and to what extent the model was copied