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Core Studies: Cognitive Area

Loftus and Palmer (1974) eyewitness testimony: the second experiment, conclusions and evaluation

  • 3 things to know
  • Component 02

Overview

Recall questions on Loftus and Palmer's second experiment, including its sample, groups, the broken glass question and results, the conclusion about how memory of an event is formed, police questioning, and the study's control, sample, ecological validity, ethics and demand characteristics.

What you need to know

Answer each one before you reveal it.

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Key term

What happened when participants returned a week later?

Key term

What film was used in the second experiment?

Who and when

How did the three groups in the second experiment differ?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Why was a second experiment necessary?

    Model answer

    The first experiment could not separate response bias from a real change in memory, so a second study was needed to look for a lasting distortion.

  2. 2

    Who took part in the second experiment, and how were they allocated?

    Model answer

    One hundred and fifty students were divided into three independent groups of fifty.

  3. 3

    What film was used in the second experiment?

    Model answer

    A film lasting about a minute showing a multiple-car accident, in which the crash itself lasted about four seconds.

  4. 4

    How did the three groups in the second experiment differ?

    Model answer

    One group's critical question used the verb smashed, one used the verb hit, and a control group was asked nothing at all about speed.

  5. 5

    What happened when participants returned a week later?

    Model answer

    They answered further questions about the accident, including the critical question of whether they had seen any broken glass.

  6. 6

    Why was the broken glass question the critical one?

    Model answer

    There was no broken glass in the film, so any participant answering yes must have had a memory that had been distorted.

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