In the 1960s, researchers started to study facial expressions that matched six basic emotions: happiness, sadness, anger, surprise, fear, and disgust.
Some researchers now say there are fewer than six basic emotions, and others say there are more (up to 21). But the idea remains that emotions are biologically universal to all humans, and displayed through facial expressions.
When asked to explain in words what emotion is, we may come up with ideas that feel right, such as "sensitivity to events," or "your mind's reaction to experience," but fundamentally, emotions are intangible and the definitions offered are not good enough for science.
Words like "joy" and "rage" describe a set of complex processes in the brain and the body that are not always related.
A 1980 study found that when people were shown photographs with posed pictures, people were 80 percent likely to label the expressions correctly. However, when they were shown photos of spontaneous emotions, the rate of recognition went down to 26 percent.
Psychologist Paul Ekman claims that microexpressions can show what people are feeling, even when they try to hide it.
Critics state that facial expressions are not the measurement of emotions. Measuring what someone actually feels is difficult to do with anything other than self-report. However, even this methodology is inefficient since the memory for emotional experience is highly unreliable.
There is still no consensus on what emotions are. Scientists agree more on what emotion does than what it is.
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