Person perception is a fundamental sub-discipline of social psychology that investigates how individuals form impressions of, make judgments about, and attribute traits to other people. Unlike object perception, person perception involves dynamic, intentional agents who possess internal states, motivations, and the capacity to perceive the perceiver back.
- Solomon Asch's Configural Model (1946): Asch proposed that person perception is holistic rather than additive. He demonstrated the existence of central traits (e.g., 'warm' vs. 'cold') which disproportionately shape the overall impression, and peripheral traits which have minimal impact. His classic experiment involved presenting participants with lists of traits containing either 'warm' or 'cold' and observing radically divergent overall impressions.
- Anderson's Algebraic (Information Integration) Model (1965): Challenging Asch's Gestalt approach, Norman Anderson argued that impressions are formed through a mathematical averaging of individual trait values. The overall impression ($R$) is a weighted sum of the values of the individual attributes: $R = \sum w_i s_i$, where $w_i$ represents the weight of the trait and $s_i$ represents its scale value.
- Implicit Personality Theories (Bruner & Tagiuri, 1954; Schneider, 1973): These are naive, idiosyncratic belief systems held by individuals regarding which personality traits co-occur in human nature (e.g., assuming that someone who is intelligent is also cold, or someone who is physically attractive is also competent—the 'Halo Effect').