According to Paul Ekman, facial expressions for basic emotions are innate and hard-wired into the brain.

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Paul Ekman's research has shown that basic emotions such as happiness, sadness, anger, fear, disgust, and surprise are universally expressed through specific facial expressions that are innate and hard-wired into the brain. This theory is called the universality hypothesis. Ekman's research has also shown that these expressions are recognized cross-culturally, supporting the idea that they are innate and not learned.

According to Paul Ekman, Facial Expressions for Basic Emotions Are