Emotion is a complex psychophysiological experience of an individual's state of mind as interacting with biochemical (internal) and environmental (external) influences. In humans, emotion fundamentally involves "physiological arousal, expressive behaviors, and conscious experience." Emotion is associated with mood, temperament, personality, disposition, and motivation. Motivations direct and energize behavior, while emotions provide the affective component to motivation, positive or negative.
No definitive emotion classification system exists, though numerous taxonomies have been proposed. Some categorizations include:[citation needed]
Several different theories aim to explain the origin, neurobiology, experience, and function of emotions.
The English word emotion is derived from the French word émouvoir. This is based on the Latin emovere, where e- (variant of ex-) means "without" and movere means "move." The related term "motivation" is also derived from the word movere.