Researchers report that mental representations of facial expressions of pain and orgasm are distinct based on an analysis of 40 Western and 40 East Asian observers; mental representations of pain were similar among Western and East Asian observers, whereas representations of orgasm contained culture-specific elements, suggesting that facial expressions serve a communicative role and that culture shapes the representation of the expressions.
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Article #18-07862: "Distinct facial expressions represent pain and pleasure across cultures," by Chaona Chen et al.
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Proceedings of the National Academy of Sciences