Greg Bryant, a professor at UCLA, explains his studies on laughter. Using acoustic analysis, he found that real laughter was more emotional, closer to animals, and fake laughter was closer to speech.
Source: http://www.npr.org/2014/05/08/310794138/how-to-tell-when-a-laugh-is-real-the-answer-is-in-a-breath?ft=1&f=1007
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