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In psychology , affect is used to describe mood, especially a change in mood. However, while affect may describe mood, the two are completely different in meaning. Mood is a state of feeling (emotional), usually temporary, resulting from a specific stimulus. The word is derived from an ancient English word âmodâ which meant courage especially during war times.
The most common usage of affect is as a verb, meaning to impact. Effect is usually a noun, meaning the result or consequence of something. However, both affect and effect have alternate meanings when used as different parts of speech. 1 Differences in Usage.