PSC 153 Lecture 4: Lie Detection aka Credibility Assessment
Document Summary
Psc 153 lecture 4 lie detection (credibility assessment) Long been part of the legal system. Trial by ordeal in the middle-ages holding hot iron, if wound heals, then not guilty. Acquittal rate 50% of those suspected of crime. Now more sophisticated techniques to detect lies. Lies of commission saying something not true. Lies of omission not saying something true. The legal system puts a lot of faith in jurors" and interrogators" ability to detect lies. Additional factors (time to rehearse lie, observing same person multiple times) make it. It requires counterfactual thought easier/harder but only by 2% Research shows professionals are actually worse than lay people in detecting lies but were more confident about their judgements. Training people to detect lies only increases confidence. 70% of people hold liar stereotypes but behavioral cues are not reliable. Presumption of innocence in the legal system innocent until proven guilty.
