Facial expressions are a key asset in our arsenal of communication methods. Without saying a word, we can alert those around us to our emotional state—ranging from elation to sorrow—simply by flexing a few muscles. Such expressions have evolved to help us connect with one another, avoid danger and work together. Fellow humans, however, are not the only ones potentially tuning in to the information our expressions convey. According to the results of a study published today in Current Biology , dogs have hacked this silent method of communication, at least enough to distinguish between angry and happy facial expressions.

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Facial Expressions Do Not Reveal Emotions



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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. Voluntary facial expressions are often socially conditioned and follow a cortical route in the brain.


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You've worked twelve hours and are feeling tired and frustrated, but you force yourself to keep a neutral expression on your face. You're too worn out to keep typing, but you can't yawn, grimace, or frown because an all-seeing eye is watching you. The eye charts your emotions, and — make no mistake — it will tell on you if you look a little too angry.



Diminich, Erica. A long standing debate in psychological science is whether the face signals specific emotions. Basic emotion theory presupposes that there are coordinated facial musculature movements that individuals can identify as relating to a core set of basic emotions.