| Term | Definition |
| emotion | response of the whole organism, involving physiological arousal, expressive behaviors, and conscious experience |
| James-Lange theory | theory that our experience of emotion is our awareness of our physiological responses to emotion-arousing stimuli |
| Cannon-Bard theory | theory that an emotion-arousing stimulus simultaneously triggers physiological responses and the subjective experience of emotion |
| two-factor theory | Schachter-Singer's theory that to experience emotion one must by physically aroused and cognitively label the arousal |
| polygraph | machine, commonly used in attempts to detect lies, that measures several of the physiological responses accompanying emotion |
| cartharsis | emotional release; "releasing" aggressive energy relieves aggressive urges |
| feel-good, do-good phenomenon | people's tendency to be helpful when already in a good mood |
| subjective well-being | self-perceived happiness or satisfaction with life |
| adaptation-level phenomenon | our tendency to form judgements (of sounds, of lights, of income) relative to a neutral level defined by our prior experience |
| relative deprivation | perception that one is worse off relative to those with whom one compares oneself |