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Detecting Lies - Mann et. al
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- 1BackgroundInterviews establish guilt or innocence of an arrested person
- e.g. by getting them to talk about little known parts of crime
Vrij → accuracy rate of 57% in detecting lies
- not much above chance
- but had poor mundane realism
Police think they call tell if someone is lying through small body language details
= e.g looking down, putting hand over face while speaking - 2AimTo test police officers' ability to distinguish truths and lies during police interviews with suspects
- 3Sample99 Kent Police officers
( 24 females, 75 males)
mean age: 34.3 years
78 detectives
8 trainers
4 traffic officers
9 uniformed officers - 4ProcedureAsked to judge the truthfulness of suspects in real police interviews
Saw video clips of 14 suspects showing their head + torso
= So expression and movement was visible
= 54 clips: 6 - 145 seconds long
Truths/Lies backed up by other evidence
Began by filling out questionnaire on their experience in detecting lies
- After each clip they indicated whether they thought it was truth or lie and how confident they were in this
Finally they listed all cues they had used to detect lies - 5ResultsDifferences between truth and lie accuracy insignificant
- 66.2% and 63.6%
But together are significant since they are greater than chance
Experience in interviewing correlated with accuracy
→ Truth: 0.20
→ Lies: 0.18
Most frequently used cue was gaze, second was movement
→ Vagueness, contradictions in stories, and fidgeting also mentioned - 6CGood lie detectors rely more on story cues than actions
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- Descripción
- A-Level (Forensic - Making a Case) Psychology Fichas sobre Detecting Lies - Mann et. al, creado por Amelia S el 19/05/2016.
- Creado por
- Amelia S
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