Why do researchers think that basic emotions are inborn?

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Researchers argue that basic emotions are inborn because they emerge at about the same ages across all cultures and are interpreted similarly across different cultures, suggesting a biological basis for their appearance. There is no evidence of a specific gene that dictates emotional expression, and the fact that infants demonstrate emotions in the same way as their parents could reflect cultural learning rather than innate behavior. The difference in emotional expression between boys and girls could reflect socialization rather than biology.

Why Do Researchers Think That Basic Emotions Are Inborn