Psychologists define the term as a complex psychological state that involves subjective experience, a physiological response, and a behavioral or expressive response

Psychologists define the term EMOTION as a complex psychological state that involves subjective experience, a physiological response, and a behavioral or expressive response 
For example, two different persons may react differently when standing alone in an elevator.
One person may experience an emotion of distress because of her past experience about her being trapped on small space as a kid, while the other person may experience the emotion of peace and calmness

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