Mann Flashcards
What subsection is Mann apart of?
Interviewing suspects
What are the other studies in this subsection?
Mann
Inbau gudjohnsson
What was the aim of of Mann research?
To test police officers ability to distinguish truths and lies during police interviews with suspects
What was the method?
Field
How many participants were there?
99 police officers 24 females 75 males
What jobs did participants have?
Detectives traffic officers
Trainers
What was the main task given to p/s?
Asked to judge the truthfulness of people in real life police interviews
How many suspects were there?
14
What controls where used?
Showing head, torso so expressions and movements were visible
How many clips were there and how did they vary?
6-145 seconds
54
What did officers have to complete?
A questionnaire on experience of telling lies
What did participants have to do after they watch the clips?
State whether they thought if it was the truth or a lie
How confident they were in their decision
Then to list cues they had seen to detect lies
What was the mean lie accuracy?
66.2%
What was the mean truth accuracy?
63.6% (not significant but greater than chance)
What was another finding?
Experience in interviewing was correlated with truth accuracy and lie accuracy
What was the most frequently mentioned cues?
Gaze
Movements vagueness
Contradictions fidgeting
What was the first conclusion ?
The level of accuracy are higher than in other studies
Highest for ordinary police officers
What was the second conclusion?
The more experienced an officers, the better they are at detecting lies
Good lie detectors rely on story cues rather than stereotypical views of certain cues
What is a final cue?
Police officers can detect lies above level of.chance but often pay attention to cues that are not diagnosis cues to deceit possibly due to appearing in police manuals
