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The primacy effect occurs when individuals give disproportionate weight to information learned first, acting as a cognitive anchor that shapes how subsequent information is processed. People interpret new information to fit their initial impression. For example, if a roommate is perceived as neat, later untidiness may be viewed as a rare lapse rather than habitual messiness, demonstrating how early cues dominate judgment formation.

Confirmation bias reinforces the primacy effect by causing individuals to selectively interpret later observations to fit their preexisting perceptions. If a job candidate appears confident initially, minor signs of nervousness later may be overlooked or reinterpreted as situational. This selective processing strengthens the initial impression and reduces the impact of contradictory information encountered afterward.

The recency effect occurs when recent information holds greater influence, particularly when equal attention is given to all details or when long gaps exist between observations. In courtroom settings, jurors' verdicts can shift depending on whether prosecution or defense presents their case last. Similarly, student course evaluations gathered at semester's end show students focus more on recent classes than earlier ones.

Positive moods increase reliance on first impressions, as individuals in good moods process information more heuristically, relying on initial cues. Conversely, negative moods encourage more deliberate, systematic processing, reducing susceptibility to the primacy effect. This emotional variability means mood significantly influences how information is weighted and can lead to different social judgments in identical situations.

When individuals encounter new people, they quickly form impressions based on available cues such as appearance, tone of voice, and behavior. These initial cues act as cognitive anchors, shaping how subsequent information is processed and interpreted. First impressions strongly influence perceptions across various social settings, including job interviews, group interactions, and romantic encounters.

First impressions play a crucial role in social perception, shaping how individuals assess others in professional, academic, and interpersonal contexts. In job interviews, initial judgments can disproportionately influence hiring decisions through the primacy effect. Understanding these cognitive biases allows individuals to approach social interactions with greater awareness, leading to more objective and balanced evaluations.

After forming first impressions, individuals often use attribution processes to explain others' behavior. These explanations are influenced by whether people attribute actions to personal characteristics or situational factors. Understanding how initial impressions shape these attributions helps explain why people maintain consistent judgments even when presented with contradictory evidence about another person's true nature.