What was the aim of Mann's study into police officer's ability to detect suspect's lies
To test police officer's ability to distinguish truths and lies during police interviews with suspects.
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Describe the methodology of Mann's research
Field experiment.
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Who were the participants used in Mann's study?
99 Kent Police Officers, 24 female and 75 males. Mean age of 34.3.
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Describe who the participants were
78 were detectives, 8 were trainers, 4 were traffic officers and 9 were uniformed response officers.
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What were the participants asked to judge and what did they watch?
Asked to judge the truthfulness of people in real-life police interviews. Watched video clips of 14 suspects showing head and torso so expression and movement were visible.
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What were the clips backed up with?
Clips backed up with other evidence that established whether the suspect was lying or telling the truth at any point.
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How did the clips vary in length and what did the officers have to do?
The 54 clips varied in length from 6 to 145 seconds. Police officers filled out a questionnaire about their experience in detecting lies.
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What did the police officers then do and what was the procedure after each clip?
They watched each clip and after each indicated whether they thought it was a lie or truth and how confident they were about their decision.
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What did the police officers then list?
Asked to list the cues they had used to detect the liars.
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Describe the difference between the mean lie accuracy and truth accuracy.
Difference between mean and truth accuracy was not significant. Mean lie accuracy = 66.2%, truth accuracy = 63.6%
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What are the findings about levels of accuracy?
Both levels of accuracy are significantly greater than chance (50%).
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What was experience in interviewing correlated with?
Correlated with truth accuracy and lie accuracy,
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What was the most frequently mentioned cue to detect lying?
was gaze, 2nd was movements, vagueness, contradictions in stories and fidgeting.
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What do the levels of accuracy found in this study exceed?
Exceed those found in other studies and are the highest for a group of ordinary police officers.
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What would be required to establish whether they were any better than lay people?
A control group would be needed, but lay people could not be shown the sensitive material in the video clips.
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What did it mean, the more experience an officer has?
More experience meant the better they get at detecting lies.
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What do good detectors rely on more?
Rely more on story cues than the more popular stereotypical belief that liars give themselves away by covering the mouth or fidgeting.
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What can police officers detect above the level of chance and what do they often pay more attention to?
Able to detect liars above level of chance and pay attention to cues that are not diagnostic cues to deceit. Possibly because they appear in police manuals.
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Other cards in this set
Card 2
Front
Describe the methodology of Mann's research
Back
Field experiment.
Card 3
Front
Who were the participants used in Mann's study?
Back
Card 4
Front
Describe who the participants were
Back
Card 5
Front
What were the participants asked to judge and what did they watch?
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