If you want to be a good spy, con artist, or poker player, you have to be able to lie. If you want to be a
great spy, con artist, etc., you have to be able to tell when
other people are lying. The theory goes like this: A person’s brain works harder when they’re dissembling than when they’re speaking the truth, and this extra cognitive load has physical manifestations. Here’s how to read the tells.
Observe the pupils Lying causes physiological arousal, so look into a person’s eyes: A fibber’s pupils often dilate right after they tell a tale. (This involuntary response is why many poker players wear shades.)
Stage a reading People reading a statement they know is false skip words or read more quickly. Test suspected liars by making them read alternate versions of their stories.
Watch for saccades Blinking isn’t a tell, but an unfixed gaze might be. A liar’s eyes may bounce all over a scene instead of fixing and focusing.
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