The shape of the face is influenced by the bone-structure of the skull , and each face is unique through the anatomical variation present in the bones of the viscerocranium and neurocranium. Skeletal anatomy of the face. The fusiform face area , within the fusiform gyrus , is activated by faces, and it is activated differently for shy and social people. A study confirmed that "when viewing images of strangers, shy adults exhibited significantly less activation in the fusiform gyri than did social adults". It includes several distinct areas,  of which the main features are:. Faces are essential to expressing emotion , consciously or unconsciously. A recent study looked at individuals judging forced and genuine smiles.
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