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About facial expression

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Facial expressions are used by humans to convey various types of meaning in various contexts. In this mini review we summarize findings on the use and acquisition of facial expressions by signers and present a unified account of the range of facial expressions used by referring to three dimensions on which facial expressions vary: semantic, compositional, and iconic. Humans perceive facial expressions as conveying meaning, but where do they come from and what exactly do they mean? Based on observations of facial expressions typically associated with emotions Darwin hypothesized that they must have had some instrumental purpose in evolutionary history. For example, lifting the eyebrows might have helped our ancestors respond to unexpected environmental events by widening the visual field and therefore enabling them to see more.
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How to Read Facial Expressions

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Facial expression - Wikipedia

A facial expression is one or more motions or positions of the muscles beneath the skin of the face. According to one set of controversial theories, these movements convey the emotional state of an individual to observers. Facial expressions are a form of nonverbal communication. They are a primary means of conveying social information between humans , but they also occur in most other mammals and some other animal species. Humans can adopt a facial expression voluntarily or involuntarily, and the neural mechanisms responsible for controlling the expression differ in each case.
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Facial expressions, emotions, and sign languages

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Humans are emotional creatures. Our emotional state informs how we behave from the most fundamental processes, to complex actions and difficult decisions [1, 2]. Our lives are in many ways guided by our emotions, so knowing more about emotions allows us to know more about human behavior more generally. There are questionnaires built to measure the emotional state of an individual, although misleading biases can be easily introduced as with any questionnaire; [3].
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