Tuesday, October 30, 2012

The basic study of eyewitness testimony

The basic study of eyewitness testimony was held by Loftus and Palmer’s (1974). In this study, their aim was to investigate how information supplied after an event, influences a witness's memory for that event.
 Loftus and Palmer showed a series of car crash’s video to 45 students. They asked each student to fill in a questionnaire after they had seen video. One of the question was ‘How fast were the cars traveling they (smashed / collided/ bumped/ hit / contacted) into each other? Each group receives a sentence with different verb.
That finding was that the estimated speed was affected verb used. The verb implied information about the speed, which systematically affected the participants’ memory of the accidents. For example in Loftus and Palmer's second experiment, the participants first form some memory of the video they have witnessed. The experimenter then, while asking ‘Did you see any broken glass?’
It is very clear that questions following an event can influence our memories, so much so that those who were asked about speed of the car using the word ‘smashed’ felt that there was indeed smashed glass. Those not asked about the speed, and those in the group where the word ‘hit’ was used, were much less likely to remember seeing glass.
This research suggests that the wording of questions can affect the judgments of an eyewitness, and may prompt false memories.

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