Emotion
Emotion is a complex psychological state involving feelings, physiological changes and behavioural responses. Emotions organise our attention, motivate action and colour every relationship, yet their exact sequence — body first, mind first, or both together — has divided psychologists for over a century. This lesson examines the nature and components of emotion, types of emotions, the physiology behind them, the classic theories, expression and regulation.
"Emotion is a feeling state that involves physiological changes, subjective experience and expressive behaviour."
Nature of emotions
- Subjective and personal; usually short-lived but can be intense.
- Triggered by internal (thoughts, memories) or external events.
- Involve physiological, cognitive and behavioural components.
- Vary in intensity and duration; universal but expressed differently across individuals and cultures.
Moods differ from emotions in being longer-lasting and less tied to a specific trigger. A key misconception is that emotions are "irrational" opposites of reason; in fact emotions provide essential information that guides rational decision-making.
Components of emotion
- Cognitive — thoughts and interpretation (e.g. "I am in danger").
- Physiological — body changes (increased heart rate, sweating, tension).
- Behavioural — expressions and actions (facial expression, crying, fighting, avoiding).
Emotion has three interacting components.
Types of emotions
- Basic emotions — universal and innate (per Paul Ekman): happiness, sadness, fear, anger, disgust, surprise. Ekman found these are recognised across cultures, even remote ones.
- Complex emotions — learned combinations of basic emotions (love, guilt, pride, jealousy, shame). They emerge with cognitive development and socialisation.
- Positive emotions — pleasant (happiness, contentment, interest, love).
- Negative emotions — unpleasant (anger, fear, sadness, disgust, anxiety).
Ekman's six basic emotions are the universal core of emotional life.
Physiological changes during emotion
- Nervous system — increased arousal; release of adrenaline.
- Cardiovascular — increased heart rate and blood pressure.
- Respiratory — faster, deeper breathing.
- Gastrointestinal — reduced appetite; increased gastric activity (sometimes).
- Muscular — muscle tension; readiness for action.
- Skin — sweating, goosebumps, blushing or pallor.
These changes are orchestrated by the autonomic nervous system and the limbic system — notably the amygdala, which rapidly appraises threat. This machinery overlaps heavily with the Stress [blocked] response; see Biological Basis of Behaviour [blocked] for the underlying anatomy.
Theories of emotion
- James-Lange — emotions result from physiological changes; we feel afraid because our body trembles and the heart beats faster.
- Cannon-Bard — emotional experience and physiological changes occur simultaneously; the thalamus sends signals to body and mind at the same time.
- Schachter-Singer (two-factor) — emotion equals physiological arousal plus cognitive interpretation (the same arousal can be labelled fear or excitement depending on the situation).
The three theories place body and mind in different orders.
Evidence informing these debates includes the facial feedback hypothesis (imitating an expression can shift how you feel) and Schachter and Singer's classic adrenaline experiments, in which arousal was labelled differently depending on the social context.
Emotional expression
Emotions are expressed through facial expressions, voice tone, body language and behaviour. Some expressions are universal (happiness, anger, fear), while cultural and social factors influence how emotions are expressed — so-called display rules govern when and how intensely emotion may be shown.
Emotional control
The ability to regulate and manage one's emotions in a socially acceptable way — through positive thinking, deep breathing and meditation. It reduces stress and anxiety, improves relationships and supports effective decision-making. Emotion regulation underlies emotional intelligence and connects to Intelligence [blocked], Stress [blocked] and Adjustment [blocked].
Key takeaways
- Emotion combines subjective feeling, physiological arousal and expressive behaviour, triggered internally or externally.
- Ekman identified basic universal emotions: happiness, sadness, fear, anger, disgust and surprise; complex emotions are learned blends.
- Physiological changes are driven by the autonomic nervous system and limbic structures such as the amygdala.
- James-Lange says body first, Cannon-Bard says simultaneity, and Schachter-Singer says arousal plus cognitive labelling.
- Facial expressions are largely universal, but display rules vary by culture.
- Effective emotion regulation lowers stress and improves relationships and decisions.
Sources & further reading
This material is educational and does not replace individual clinical care. If you are in crisis, contact local emergency services or a crisis line.