Loftus & Palmer

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Loftus & Palmer

Loftus and Palmer

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First Experiment

First Experiment 

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Method

Method 

  • Laboratory Experiment
  • Independent Measures Design 
  • 1st Experiment DV: Speed Estimate
  • 2nd Expewriment DV: Reporting seeing broken glass
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Procedure

Procedure 

  • 45 Students
  • 5 conditions with varying severity of the verb
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Results

Results 

  • Smashed = 40.8 
  • Collided = 39.8
  • Bumped = 38.1
  • Hit = 34.0
  • Contacted = 31.8
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Second Experiment

Second Experiment 

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Procedure

Procedure 

  • 150 students ( 3 groups of 50)
  • Asked questions about clip
  • Critical question asked 1 week later: Did you see any broken glass?
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Results

Results 

Smashed

  • Yes = 16
  • No = 34

Hit

  • Yes = 7
  • No = 43

Control 

  • Yes = 6
  • No = 44
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Explanation

Explanation

  • Two types of information make up memory: information percieved during an event and information supplied after an event 
  • Broken Glass = More severe accident 
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Evaluation

Evaluation 

Strength

  • Precise control over variables
  • Establishes cause and effect 

Weaknesses

  • Low ecological validity = more difficult to generalize
  • Student sample = Less experianced drives / better on memory tasks


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Criticism and Praise

Citicism and praise 

Criticism:

  • Other factors may influence memory 
  • memory can be retireved again in correct conditions 

Praise 

  • Useful applications in Law
  • Wider implcations 
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