How do lie detectors work

Lying is an important human capacity and a necessary, frequently deployed skill for greasing the rails of social commerce. The emergence of lying, a complex cognitive operation, represents a major milestone in normal child development.

Lying is a form of impression management.

We lie mainly to escape social punishment or obtain social rewards. Lying is for verbal communication what dress and makeup (or Instagram posts) are for visual communication; it can confer advantages in the social contest and rests on evolutionary foundations.

Lie detector machine

If I can make myself look bigger and more menacing than I am, I may deter a predator; if I can make myself seem harmless, I may snare prey; if I can make myself seem more alluring I may attract a mate.

Alas, like all other human social capacities, lying has a dark, destructive side and can bring about misery, chaos, and conflict.

Thus, the ability to reliably detect lying in practical social situations would be of obvious value. Think of how hiring practices and the legal, justice, and political system

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