PSY100H1 Lecture Notes - Lecture 15: Paul Ekman, Polygraph, Microexpression
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Polygraph operators claim an accuracy rate of around 90% David lykken demonstrates that there is no basis for this claim. Laboratory studies tend to find that lie detection based on polygraph data is 70% to 85% accurate. Operators claim that laboratory results cannot be generalized to real situations. In the lab, people are not in jeopardy so they do not feel strong anxiety about being found out. The cues people use to decide if someone is lying or telling the truth have been studied in natural settings such as in airport customs inspections. People tend to agree on the cues they consider to be signs of lying, but these cues are not accurate. Research has shown that people are usually not good at detecting lies. Six emotions people can pick out quite accurately = happiness, fear, disgust, anger, surprise, and sadness. Cultural norms influence our expression of emotions: display rules: what is appropriate in different cultures.
