Penrod and Cutler

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Penrod and Cutler

Results

67% convicted when witness was 100% sure

60% convicted when witness was 80% sure

Only significant effect was witness confidence

Participants

Eligible and experienced jurors

Undergraduates

Conclusion

Jurors' trust in confidence is indiminished

Confidence is a poor predictor of witness accuracy

Procedure

Participants had to decide if robber was found guilty or not

Participants experienced either high or low variable conditions on a random basis

10 variables altogether

4 of the variables

Witness confidence

80% confident

100% confident

Retention interval

2 days

14 days

Weapon focus

LOW: Weapon visible

HIGH: Weapon clearly brandished

Suspect in discuise

LOW: Minimal disguise

HIGH: Heavily disguised

Witness testified either 80% or 100% sure she identified the robber

videotape of robbery trial

Methodology

Independent measures design

Mock-trial scenario

Experiment