Horns effect occurs when an individual is downgraded because of a single negative characteristic or incident.

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Horns effect, also known as the devil effect, is a cognitive bias that occurs when a person's perception of someone is negatively influenced by a single negative trait, behavior or incident. It is the opposite of the halo effect, where a person's positive trait or behavior makes them appear more favorable overall.

Horns Effect Occurs When an Individual Is Downgraded Because of a Single