From Wikipedia, the free encyclopedia.
A person's mood is the repertoire of emotions and thoughts experienced at a particular time. In normal functioning, moods are largely adaptive to external events.
An optimist and a pessimist evaluate a situation relatively favorably and unfavorably, respectively. This applies also to expectations. The optimist looks at the world "through rose-tinted spectacles".
Mood disorders are mental illnesses where the normal functioning of mood is disrupted.
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