Facial expressions

thumb|Detail of the Mona Lisa, who is known for her smilethumb|A smiling child A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses delight, sociability, happiness, joy, or amusement. It is distinct from a similar but usually involuntary expression of anxiety known as a grimace. Although cross-cultural studies have shown that smiling is a means of communication throughout the world, there are large differe

motions or positions of subcutaneous human face muscles, conveying emotional state

A wink is a facial expression made by briefly closing one eye. A wink is an informal mode of non-verbal communication usually signaling shared hidden knowledge or intent. However, it is ambiguous by itself and highly dependent upon additional context, without which a wink could become misinterpreted or even nonsensical. For example, in some regions of the world, a wink may be considered rude or offensive. Depending on the relationship of the people involved, a wink could possibly constitute a sexual gesture.

thumb|Ahegao facial expression thumb|Belle Delphine making the ahegao expression

trauma symptom

thumb|The Smoker, Joos van Craesbeeck

motif in archaic Greek art

type of facial expression

thumb|Microexpressions of emotions (in order: surprise, fear/shock, sadness, anger, happiness and disgust)

spasm of the facial muscles

alt=Akanbē is a Japanese facial gesture performed by pulling down the lower eyelid to reveal the reddish underside of the eye, often accompanied by sticking out the tongue|thumb|233x233px|A man making the gesture

thumb|In his 16th-century portrait of an unidentified man, Albrecht Dürer powerfully captures personality through [[facial expression, body language, and clothing. Work: Bildnis eines unbekannten Mannes (1521)]]

facial expression characterized by neutral positioning of the facial features

human ability to roll the tongue into a tube

thumb|right|A typical gurn

facial expression

hypothesis that facial movement can influence emotional experience

thumb|upright|Drawing of a Parkinson's disease patient face showing hypomimia. Depiction appeared in Nouvelle iconographie de la Salpétrière, tome 1 (1888) Hypomimia (masked facies, masking of facies, mask-like facial expression), a medical sign, is a reduced degree of facial expression. It can be caused by motor impairment (for example, weakness or paralysis of the facial muscles), as in Parkinson's disease, or by other causes, such as psychological or psychiatric factors (for example, if a patient does not feel emotions and thus does not show any expression). Persons receiving excessive Boto

system to taxonomize human facial movements by their appearance on the face

thumb|Emoji illustrating eye-rolling Eye-rolling is a gesture in which a person briefly turns their eyes upward, often in an arcing motion from one side to the other. In the Anglosphere, it has been identified as a passive-aggressive response to an undesirable situation or person. The gesture is used to disagree or dismiss or express contempt for the targeted person without physical contact.

thumb|upright=1.35|Vowel lip shapes in a 1919 lip reading manual

psychological disorder proposed by professor Makoto Natsume

raising of eyebrows as a social signal

thumb|A man squinting on a sunny day

cinematic technique