In this study Loftus and Palmer are attempting to demonstrate that memory is not a factual recording of an event and that memories can become distorted by other information which occurs after the event.
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Aim
To see the effect of leading questions on the memory of an event
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Experiment 1 - Sample
45 students of the University of Washington
Split into 5 groups of 9
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Experiment 1 - Procedure
Laboratory Experiment
Independent Measures Design
They were each shown seven film-clips of traffic accidents
The clips ranged from 5 to 30 seconds long.
Following each clip, the students were asked to write an account of the accident they had just seen.
IV - The verb in the critical question
DV - Estimate of the speeds
There were five conditions in the experiment:
Condition 1: 'About how fast were the cars going when they smashed into each other?'
Condition 2: 'About how fast were the cars going when they collided into each other?'
Condition 3: 'About how fast were the cars going when they bumped into each other?'
Condition 4: 'About how fast were the cars going when they hit each other?
Condition 5: 'About how fast were the cars going when they contacted each other?'
In each condition, a different word or phrase was used to fill in the blank. These words were; smashed, collided, bumped, hit, contacted.
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Experiment 1 - Results
Verb & Estimation of Speeds:
Smashed: 40.8 mph
Collided: 39.3 mph
Bumped 38.1 mph
Hit 34.0 mph
Contacted 31.8 mph
Estimate of the cars speeds did vary according to the verb used in the crictical question
'Contacted' got the lowest estimate and 'Smashed' got the highest.
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Experiment 2 - Sample
150 participants
Split into 3 groups of 50
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Experiment 2 - Procedure
Participants viewed a short (one minute) film which contained a 4 second scene of a multiple car accident
There were three conditions:
'How fast were the cars going when they hit each other?'
'How fast were the cars going when they smashed into each other?'
Control group (One set of participants weren't asked about the speed of vehicles)
One week later, the participants returned and, without viewing the film again, they answered a series of questions about the accident.
The critical question was 'Did you see any broken glass?'
There was in fact no broken glass in the film.
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Experiment 2 - Results
Response to the question 'Did you see any broken glass?'
'Smashed' Yes = 16, No = 34
'Hit' Yes = 7, No = 43
'Control' Yes = 6 No = 44
These results show that the verb (smashed) in the question did have a significant effect on the mis-perception of glass in the film.
Those participants that heard the word ?smashed? were more than twice as likely to recall seeing broken glass.
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Conclusions
There are 2 types of info which make up a memory:
Information we get from percieving an event
Information we get after the event eg. questions asked.
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