The process by which a person evaluates and forms an overall opinion of another person based solely on one specific trait or dimension, is referred to as halo and horn effect.

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The halo effect occurs when an observer's overall impression of a person, company, brand, or product influences the observer's feelings and thoughts about that entity's character or properties. Conversely, the horn effect is when a negative trait affects the perception of the individual as a whole. Both are cognitive biases that describe how the perception of one quality (positive or negative) can influence overall evaluation.

The Process by Which a Person Evaluates and Forms an Overall