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 Interest 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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