I. Definition: Also known as the halo effect, it belongs to social cognitive bias. It refers to the phenomenon where people, after forming a positive or negative impression of a person's prominent trait, use this as a basis to infer all other traits, generalizing from a single instance. II. Core Logic: Strengths amplified → complete affirmation; Weaknesses highlighted → complete negation (also called the devil effect/negative halo). III. Causes: 1. Cognitive efficiency: The brain simplifies judgments, avoiding complex thinking; 2. Subjective projection: Using first impressions and stereotypes instead of objective observation; 3. Emotional predisposition: Likes/dislikes arise first, then rationalize the judgment. IV. Typical Examples: 1. Physical appearance halo: Good looks are assumed to indicate good personality, strong abilities, and excellent character; 2. Academic performance halo: Teachers easily overlook students with excellent grades, disciplinary issues, emotional problems, and interpersonal issues; 3. Labeling bias: One mistake is labeled as "bad character, always problematic"; 4. Celebrity filter: Liking a teacher/idol leads to complete acceptance of all their words and actions.