Deception...what it is and why do we study it?
...is managing beh to give a false impression
Why Study It?
Lying seen as unmoral yet everyone does it.
Good to study the verbal and non-verbal cues people do during lying
Verbal and Non-Verbal Cues During Deception
Beliefs of Cues During Non-Verbal Deception
Fidgiting, touching hair & body, avoided eye contact
150 studies of Mock Crimes. Found there was no single V or NV cues
De Paulo et al, 2003
What is Impression Formation....
....1st impressions of a indiv or grp. Can create biases to them. e.g. we trust attractive ppl more....this is known as the 'halo effect'.
90% liars have strategy & 70% of truth tellers have a strategy
Stromwall et al, 2006
Liars plan both V & NV & truth tellers just plan V
Hartwig et al, 2007
Theories of Deception
1. Multiple Factor Model
Beh affected by emotion, cog load, and control
Emotion = guilt & excitment. Seen in more at risk lies. Higher pitched voice & more body language
Cog Load = stress of making up story & controling beh. Rigid & tense
Control = hiding emotion & cog load.
More of these on show = more cues on show
2. Self Presentation Theory
Lying involves less morals and good acting.
Factors can affect both liars and truth tellers
3. Interpersonal Detection Theory
Lying not unidirectional = feedback to lie can change its direction
Both liar and feedback indiv take part in the lie
To Be A Good Liar....
- good actor
- good at observing own body language
- prepare well
- dont show stereotypical cues
- dont imitate truth tellers