a text analysis program correctly classified liars and truth-tellers at a rate of 67% when the topic was constant and a rate of 61% overall. Compared to truth-tellers, liars showed lower cognitive complexity, used fewer self-references and other-references, and used more negative emotion words.

61% is not very useful (close to a coin toss), but it is an interesting start. of course, this research suffers from the usual problems (only 5 samples, wtf?), but given a few 100K samples, might be much more accurate.

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