What Is Body Language?

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Facial expressions are controlled by several brain regions working together.

Different areas encode facial gestures with different scales, from fast changing signals to slow, stable ones.

This timing hierarchy may explain how facial expressions stay socially meaningful and well coordinated.

The classic song "When You’re Smiling (The Whole World Smiles With You)," made famous by Louis Armstrong and later sung by artists like Frank Sinatra and Michael Bublé, captures an idea most of us take for granted: A smile is not just a movement of the face; it is a message. When one person smiles, something shifts in everyone else to invite connection and respond in kind. Beneath that seemingly effortless moment lies a complex choreography inside the brain.

A new study of primates suggests that smiling, threatening, or even chewing are not controlled by a single emotional switch or a single motor command. Instead, facial gestures emerge from a layered conversation across the brain, unfolding over time. This research focuses on macaque monkeys, whose facial muscles and social expressions closely resemble our own. The scientists recorded brain activity while the animals produced facial gestures like lip-smacking, a friendly social signal, threats, and........

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