Theories about emotions stretch back at least as far as the Stoics of ancient Greece – but to date, no definitive taxonomy of emotions exists. Though many have been proposed. And the biological necessity for some of the emotions (e.g. 'boredom' or 'shyness') remain sketchy - Source :Wikipedia
A (partial) list of 'relatively brief conscious experience characterized by intense mental activity and a high degree of pleasure or displeasure' (i.e. emotions) include:
• Affection • Anger • Angst • Anguish • Annoyance • Anticipation • Anxiety • Apathy • Arousal • Awe • Boredom • Confidence • Contempt • Contentment • Courage • Curiosity • Depression • Desire • Despair • Disappointment • Disgust • Distrust • Ecstasy • Embarrassment • Empathy • Envy • Euphoria • Fear • Frustration • Gratitude • Grief • Guilt • Happiness • Hatred • Hope • Horror • Hostility • Humiliation • Hysteria • Jealousy • Loneliness • Love • Lust • Outrage • Panic • Passion • Pity • Pleasure • Pride • Rage • Regret • Remorse • Resentment • Sadness • Saudade • Schadenfreude • Self-confidence • Shame • Shock • Shyness • Sorrow • Suffering • Surprise • Trust • Wonder • Worry.
Further, the evolutionary pressures which presumably led to the development and maintenance of emotions, remain unclear. Especially as some would seem only to have negative consequences for the individuals concrened - and for society as a whole.
The neurological and physiological processes for many emotions are completely unknown, and the brain regions which have been identified as playing a role in some (e.g. anger) appear do so by mechanisms (e.g. hormonal) which are only partially explained.
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