Mann Et Al
- Created by: Ellen Powell
- Created on: 25-09-15 09:31
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- Mann et al.
- Aim: To test police officers' ability to distinguish truths and lies during police interviews with subjects
- Methodology: Field experiment
- Participants
- 99 Kent Police Officers, 24 F/ 75 M
- Mean age of 34.3
- 78 were detectives, 8 trainers, 4 traffic officers, 9 uniformed response officers
- Procedure
- They were asked to judge the truthfulness of people in real life interviews
- clips of 14 suspercts, head and torso, backed up by evidence
- 54 clips varying from 6-145 seconds
- They began by filling out a questionnaire about their experience in detecting lies
- They indicated whether they thought it was truth and rated their confidence on this
- They were asked to list the cues they used to detect the liars
- Results
- The difference between the mean lie accuracy and truth accuracy was not significant
- Both levels of accuracy are greater than chance
- gaze was the most used cue as well as movements
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