The James-Lange theory states that emotions are caused by physiological changes in the body, such as increased heart rate, sweating, and muscle tension.

The Cannon-Bard theory proposes that emotions and physiological changes occur simultaneously, rather than one causing the other.

The Schachter-Singer theory posits that emotions arise from the interaction between physiological arousal and cognitive labeling of the situation.

The facial feedback hypothesis suggests that facial expressions can influence emotional experience, providing evidence for the role of bodily feedback in emotions.

The cognitive appraisal theory emphasizes the role of cognitive evaluations of events in shaping emotional experiences.

The differential emotions theory proposes that there are six basic emotions (joy, sadness, anger, fear, surprise, and disgust) that are universally experienced across cultures.

The evolutionary theory of emotion posits that emotions have evolved to serve adaptive functions, such as promoting survival and reproduction.

Emotional intelligence encompasses the ability to recognize and understand one's own emotions, recognize and understand others' emotions, and manage and regulate one's own emotions.

The social constructionist theory of emotion suggests that emotions are shaped and influenced by social and cultural factors, rather than being universal or biologically determined.

Emotional contagion describes the phenomenon where emotions can spread from one person to another, often through nonverbal cues and social interactions.

The appraisal theory of emotion emphasizes the role of cognitive evaluations of events in triggering emotional responses.

The psychoanalytic theory of emotion posits that emotions are largely driven by unconscious mental processes, such as repressed desires and conflicts.

Emotional regulation involves the ability to control and manage one's own emotions, rather than suppressing or ignoring them.

The linguistic theory of emotion proposes that language and verbal expression play a significant role in shaping and understanding emotional experiences.

Daniel Goleman is credited with popularizing the concept of emotional intelligence through his book 'Emotional Intelligence: Why It Can Matter More Than IQ'.