Unraveling group attractiveness: Weighted averaging and recency effects in rapid serial visual presentations (RSVP).

This study investigated how observers compute the average attractiveness of groups of faces with different identities, presented via rapid serial visual presentation. In Experiment 1, participants rated the average attractiveness of group faces, revealing a recency effect where the last face had the greatest influence. In Experiments 2 and 3, participants compared the average attractiveness of groups (with members presented in ascending, random, or descending attractiveness order) against either the arithmetic-average face (AAF; where each member contributes equally) or the weighted-average face (WAF; using recency-based weights from Experiment 1; tested only in Experiment 3). Presentation order influenced judgments for AAFs but not for WAFs; furthermore, this confirms that rapid serial visual presentation-based group-attractiveness perception relies on weighted processing incorporating the recency effect. In Experiment 4, participants rated the average attractiveness of group faces, the attractiveness of group member faces, and AAF/WAFs, and completed a memory task. The results showed that participants estimate group-average attractiveness by combining individual members' attractiveness through a weighted average, rather than by matching it to the attractiveness of the WAF itself. The recency effect observed in the memory task suggests that the recency effect in ensemble perception of facial attractiveness may reflect broader principles of memory encoding that are based on postperceptual processing. These findings offer novel perspectives on the mechanisms of group-attractiveness perception and have potential implications for group impression formation. (PsycInfo Database Record (c) 2026 APA, all rights reserved).