1. There were 150 student participants.
2. They were shown a film of a multiple car crash.
3. The film lasted less than 4 seconds.
4. The participants were then asked a set of questions, including the critical question about speed.
5. The participants were then divided into 3 groups, each of 50 participants.
6. Group 1 were asked ‘how fast were the cars going when they smashed into each other?’ Group 2: when hit. Group 3: Was controll group, no questions.
7. One week later participants were asked to return to the psychology lab, and were asked further questions about the film.
8. The critical question asked was ‘Did you see any broken glass?’ Those who thought the car was travelling faster might expect there to have been broken glass.
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