As few as 10 percent of people are even aware of seeing microexpressions when tested. They occur so fast that they're often not perceived by the conscious mind of either the expresser or the person observing the expression. Microexpressions can be as brief as about 1/25 of a second. While we provide others with visual information about the way we feel through our expressions, other information "leaks" out of our faces between or during these intentional expressions. Next, we'll learn about the frowns between the smiles: microexpressions. Are other expressions simultaneously occurring? Are they connected or separate from the smile? Is the smile symmetrical? If not, what are the measurements for each side of the face?Īnd to think of all those bumper stickers demanding that you "Smile!" without once taking into consideration how complicated an order that is to fulfill. Measuring duration takes into account the time it takes your mouth to reach the apex of its smile, how long the apex is held, and the time it takes to return to a nonsmiling state. Eye constriction (AU 6) is likewise measured. Smile strength (identified as AU 12) can be classified one of six different ways, depending on the degree the corners of the mouth are turned up. The intensity of an expression is also important. It's also noted whether the expression is voluntary or involuntary, spontaneous or intentional. The measurements don't include "sneer" or "half-smirk," because using such descriptive terms might influence the interpretation of a specific expression. The measurements used are Action Units (AUs), with each Action Unit representing a specific motion (for instance, bunching the eyebrows together is AU 4, raising the eyebrows is AU 1). For one thing, the FACS doesn't identify the emotion, only the muscles involved in making an expression.
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January 2023
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