I think that many people often maybe even everyday can think of a time when they thought that they know when someone is lying to them. Although as shown by Ekman there is very little or no correlation between somebody's confidence in there ability to detect lies and their accuracy. Which really is surprising because plenty of us have been in the position where we were one hundred percent sure that we could tell that someone is lying only to be proved wrong at a later point. As stated in the text book these feelings of confidence in detecting a lie could really become a problem in court case. Where one juror may feel very strongly that someone is lying when giving an oath. It could or often does send people into incarceration wrongly. This often can create a problem when it is involved in a court case, if a juror decides that the a witness is lying and are very confident of it they very well could be wrong and have a part in incarcerating an innocent person. Most likely most of us thinking someone is lying without a doubt is not as major of a deal as sending someone into jail. Next time you decide that someone is lying remember that you might not be right, and hopefully that helps you not be embarrassed by being wrong or even worse.
People detecting lies
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