Pennington and Hastie

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  • Created by: Steff06
  • Created on: 04-05-16 10:54
What was the aim of Pennington and Hastie's study?
To investigate whether or not story evidence summaries are true causes of the final verdict decisions and the extent to which story order affects confidence in those decisions.
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Describe the methodology of P+H's study
Laboratory experiment. The 2nd of two.
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Who were the participants in this study?
130 students from Northwestern and Chicago university. Paid for their participation in a 1 hour experiment. Allocated to 1 of 4 groups of roughly equal sizes.
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What was the main procedure for the participants?
To listen to a tape recording of the stimulus and trial and then respond to written questions.
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How were participants separated and what were the conditions?
All participants were separated by partitions and were not allowed to interact with each other.
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How was evidence arranged in the story order conditions and the witness order conditions.
Evidence in the story-order conditions was arranged in its natural order. Evidence items in the witness-order condition were arranged in the order closest to the original trial.
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What decision were participants told to make and what did they have to rate?
Participants were told to make either a guilty or not guilty verdict on a murder charge and then rate their confidence in their own decision on a scale of 1 to 5.
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What wee the 4 groups/conditions?
39 prosecution items in story order, 39 prosecution items in witness order, 39 defence items in story order, 39 defence items in witness order.
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In all cases, what did the stimulus trial begin with?
The indictment and followed by the normal procedure, ending with the judge's instructions.
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In the prosecution case, did story order or witness order convince more juror's of Caldwell's guilt in the prosecution case?
Story order persuaded more juror's of Caldwell's guilt in the prosecution case.
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What conditions meant the most jurors would find a guilty verdict?
If the defence presented its evidence in witness order, more jurors would find a guilty verdict.
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What would happen if the positions were reversed and the defence had the benefit of story order?
The guilty rate drops to 31%
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Who was the greatest confidence in their verdict expressed by?
Those who had heard the defence or prosecution in story order.
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Who was the least confidence expressed by?
Least confidence expressed by those who heard defence or prosecution in witness order.
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What was the difference in defence case due to?
The case itself where the defence case is less plausible as the victim was drunk and lunged onto the assailant's knife.
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Card 2

Front

Describe the methodology of P+H's study

Back

Laboratory experiment. The 2nd of two.

Card 3

Front

Who were the participants in this study?

Back

Preview of the front of card 3

Card 4

Front

What was the main procedure for the participants?

Back

Preview of the front of card 4

Card 5

Front

How were participants separated and what were the conditions?

Back

Preview of the front of card 5
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