LOFTUS AND PALMER (1974)
24 uni students were shown a film about a traffic incident. The were then asked leading questions (post event information) .each group were asked one critical question about the speed of the car , containing one of the following words 'smashed','hit','colided' , 'contacted'.
findings-those given the words 'smashed' estimated the highest speed whereas those who were given a question containing the word 'contacted' estimated the lowest speed.
2nd experiment-to investigate whether post even information effects retrieval or storage
150 different PPS were shown a film about a traffic accident.A week later they were asked whether they there was any broken glass
those who were given a question containing the word 'smashed' were more likely to recollect broken glass.More than 15% recalled broken glass even though there was none. This experiment showed that leading questions affect initial storage.
Evaluation -Validity -not true to life -does not represent real eyewitness testimony.
Foster et al. found that recall was more accurate in real life.
Hard to estimate speed PPS may therefore look for any available cues.