Emotionality

Emotionality is the observable behavioral and physiological component of emotion. It is a measure of a person's emotional reactivity to a stimulus. Most of these responses can be observed by other people, while some emotional responses can only be observed by the person experiencing them. Observable responses to emotion (i.e., smiling) do not have a single meaning. A smile can be used to express happiness or anxiety, a frown can communicate sadness or anger, and so on. Emotionality is often used by psychology researchers to operationalize emotion in research studies.

By the late 1800s, many high-quality contributions had been made to the theory of emotion by psychologists and scientists such as Wilhelm Wundt, George Stout, William McDougall, William James, and George Herbert Mead. William James preferred to focus on the physiological aspects of emotional response, though he did not disregard the perceptual or cognitive components. William McDougall thought of emotion as the articulation of a natural response built on instinct. Other psychologists reasoned that although gestures express emotion, this is not the entirety of their function. Wundt analyzed that emotion portrays both expression and communication.

One of the oldest issues of emotion is the one that believes emotion indicates inferiority. In early psychology, it was believed that passion (emotion) was a part of the soul inherited from the animals and that it must be controlled. Solomon identified that in the Romantic movement of the eighteenth and nineteenth centuries, reason and emotion were thought to be opposites.

...
Wikipedia