[C] Loftus and Palmer

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11 Terms

1

Aim

  • Investigation on how provided information can influence eye witness testimony

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2

Experimental Method + Design

  • Lab experiment

  • IMD

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3

Experiment 1: Sample

  • 5 groups of 9 = 45 ppts

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4

Experiment 1: IV and DV

  • IV: Critical word used (Smashed, Collided, Bumped, Hit, Contacted)

  • DV: MPH speed of car

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5

Experiment 1: Method

  • Watched a short car crash clip

  • Each asked: ‘How fast were the cars going when they [__] each other’

  • Each group given a different verb: Smashed, Collided, Bumped, Hit, Contacted

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6

Experiment 1: Results

  • Highest: Smashed (40.8)

  • Lowest: Contacted (31.8)

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7

Experiment 2: Sample

  • 3 groups of 50 = 150 ppts

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8

Experiment 2: IV and DV

  • IV: smashed/hit/[not asked]

  • DV: Broken glass recall

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9

Experiment 2: Method

  • Watched a short multi-vehicle car crash clip

  • 3 groups:

    • 1) Asked ‘How fast were the cars going when they smashed each other’

    • 2) Asked ‘How fast were the cars going when they hit each other’

    • 3) Not asked anything

  • 1 Week later → asked if they saw any broken glass

    • No broken glass was in the film

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10

Experiment 2: Results

  • Highest: Smashed (16/50 saw glass)

  • Lowest: Control (6/50 saw glass)

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11

Conclusions

  • Language (the verb used)/misleading info influences post-event memory → eye witness testimony is faulty

    • Leading questions alter memory

  • People do not reliably judge vehicle speeds

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