Bandura's Bobo Doll Experiment: How Children Learn Aggression by Watching Adults
In short
In 1961, Albert Bandura showed that children learn aggression simply by watching an adult, with no reward or punishment involved. The study became the foundation of social learning theory.
How the experiment worked
72 children aged 3–5 from the Stanford University nursery school took part. They were pre-rated for aggressiveness and matched across groups. One group watched an adult attack an inflatable Bobo doll for about 10 minutes — hitting it with a mallet, tossing it, shouting phrases like "Sock him in the nose!". Another group watched a calm adult; a control group saw no model. Half the children saw a same-sex model, half an opposite-sex model. Children were then mildly frustrated by having attractive toys taken away. Each child then spent 20 minutes in a room with a Bobo doll and other toys, observed through a one-way mirror.
Results
Children who saw the aggressive model reproduced the model's specific actions and words and were more aggressive overall.
They also invented new forms of aggression they had never seen.
Boys showed more physical aggression; the male model had a stronger effect.
The calm model somewhat reduced aggression.
Conclusions and significance for developmental psychology
Before Bandura, new behavior was thought to be acquired mainly through reinforcement. The study showed that children acquire behavior through observation and imitation. It led to social learning theory, later social cognitive theory and the concept of self-efficacy, and it still frames debates about media violence.
What it means for parents
Children copy what adults do, not what they say. Shouting, rudeness and physical punishment teach a child that this is how conflicts are solved. The good news: calm modeling works just as powerfully in the other direction.
What it means for professionals
The study underpins modeling techniques in child therapy, parent training and aggression-prevention programs. When assessing a child's aggression, ask which models the child sees at home, in preschool and on screens.
References
Bandura, A. (1965). Influence of models' reinforcement contingencies on the acquisition of imitative responses. Journal of Personality and Social Psychology, 1(6), 589–595. https://doi.org/10.1037/h0022070
Bandura, A. (1977). Social learning theory. Prentice-Hall.
Bandura, A., Ross, D., & Ross, S. A. (1961). Transmission of aggression through imitation of aggressive models. Journal of Abnormal and Social Psychology, 63(3), 575–582. https://doi.org/10.1037/h0045925
Bandura, A., Ross, D., & Ross, S. A. (1963). Imitation of film-mediated aggressive models. Journal of Abnormal and Social Psychology, 66(1), 3–11. https://doi.org/10.1037/h0048687