In this article they talked about the polygraph test, the guilty knowledge test, brain scans, and integrity tests. Before reading about lie detection I used to think that the polygraph was perfect at detecting whether or not someone is lying. Now I don't really believe in its validity. I agree with how they call it the 'arousal detector' instead of the lie detector. It is more of an arousal detector because it mainly detects the fear of being convicted of a crime that someone may or may not have committed. Some other flaws with the polygraph test is that some people can 'beat' it, have a psychopathic personality with low levels of fear and guilt, or even fail the test because of how nervous or anxious they are. The only good thing about the test is that it usually brings an actual confession once the test is over. Although the polygraph test is not 100% accurate I think that it's one of the best instruments used to detect lies as of now. I think that in the future lie detection will be much better but I don't think that there is something that happens in your brain when you actually tell a lie.
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