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The nasolabial folds, commonly known as "smile lines" [1] or "laugh lines", [2] [self-published source] are facial features. They are the two skin folds that run from each side of the nose to the corners of the mouth. They are defined by facial structures that support the buccal fat pad. [3] They separate the cheeks from the upper lip.
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Microexpressions can be difficult to recognize, but still images and video can make them easier to perceive. In order to learn how to recognize the way that various emotions register across parts of the face, Ekman and Friesen recommend the study of what they call "facial blueprint photographs", photographic studies of "the same person showing all the emotions" under consistent photographic ...
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the sincere and involuntary Duchenne smile: contraction of zygomatic major and inferior part of orbicularis oculi. The FACS is designed to be self-instructional. People can learn the technique from a number of sources including manuals and workshops, [ 7 ] and obtain certification through testing.
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A classical sign of Tetanus, risus sardonicus is a form of facial dystonia producing a fixed smiling or grinning expression. Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning.
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