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Dawn of the smile

Many Minds

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Evolution of laughter and its acoustic properties in primates and other mammals

Smiling and laughing in humans have evolved from separate sources to form a continuum of positive, affiliative displays. Research on the acoustic properties of laughter in great apes found that each species has its own distinctive flavor of laughter. Humans primarily laugh while breathing out, while other apes laugh during both inhalation and exhalation. This initial ape-like stage in human infants may explain the awkwardness of their first chuckles. The taxonomy of primate laughter matches the known primate taxonomy from genetic analysis. Furthermore, laughter-like vocalizations have been observed in other mammals such as rats and birds, suggesting that positive vocalizations during play and social interaction may be a common trait across species.

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