I’ve heard the psychological theory that all emotions stem from six base emotions, being:
So, for example, despair would be a mix of Sadness and Fear. Jealousy might be a mix of Anger and Sadness.
However, I also read a conflicting minimalist view that there are but three base emotions:
So all emotions are lesser degrees of these. So anger would be a mix of terror and despair, and irritation an even milder mix.
In the first theory all emotions can be reduced to six base emotions. The six base emotions are stated in their mildest form, however in the second theory the three emotions are at their maximum amplification, and everything else is a milder version of these. The first theory strikes me as more plausible. Also, in both, there is only one positive emotion, (One and a half if you include positive surprises), this strikes me as odd considering the amount of postitive emotions one can experience.