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Evidence: The facial expressions for each emotion are universal, observes Dr. Huang, even though individuals often show varying degrees of expression (like not smiling as broadly). Using video imagery, the new emotion-recognition software tracks these facial movements in a real face or in the painted face of Mona Lisa. By weighting the different units, the software can even identify mixed emotions (as in da Vincis masterpiece). Each expression is compared against a neutral face (showing no emotion).

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