There are currently two main scientific ways of explaining the nature of emotions.
According to one theory, emotions are judgments about the extent that the current situation meets your goals. Happiness is the evaluation that your goals are being satisfied, as when winning the lottery solves your financial problems and being asked out holds the promise of satisfying your romantic needs. Similarly, sadness is the evaluation that your goals are not being satisfied, and anger is the judgment aimed at whatever is blocking the accomplishment of your goals.
Alternatively, others have argued that emotions are perceptions of changes in your body such as heart rate, breathing rate, perspiration, and hormone levels. On this view, happiness is a kind of physiological perception, not a judgment, and other emotions such as sadness and anger are mental reactions to different kinds of physiological stages.
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