Differential Processing of Familiar and Unfamiliar Faces and Objects in Hybrid Foraging Tasks
Wed—Casino_1.811—Poster3—8811
Presented by: Carmen Peiro-Lanchares
Hybrid foraging is a type of visual search where individuals look for multiple instances of several target types among distractors, like looking for different colored shapes when playing with construction toys. These tasks offer rich cognitive information including attentional and memory processes, executive functions, or stimulus processing, among others. Behavioral and neuroimaging studies suggest differences in how faces and objects are processed. Moreover, evidence indicates that familiar faces are processed more automatically than unfamiliar ones. While previous research has examined face and object processing separately, their differential processing in complex search scenarios remains unexplored. In this study, we used a motion hybrid foraging task adapted from Gil-Gómez de Liaño & Wolfe (2022) to investigate differential stimulus processing using familiar and unfamiliar faces. Thirty-two participants completed three conditions with different stimulus: objects (stuffed animals), familiar-famous faces and unfamiliar faces. Participants had to select multiple instances of five target types among distractors. Results revealed a clear performance hierarchy: stuffed animals showed superior performance, followed by famous faces, with unfamiliar faces showing the poorest performance. Analysis of search patterns (runs-switches among target types; thus, consecutive target selections or alternations among targets) suggested that target-distractor similarity may play a crucial role in these performance differences, extending our understanding of how stimulus familiarity may modulate visual search strategies in complex scenarios. Future research combining ERP measurements while controlling for perceptual similarity across conditions will help disentangle the contribution of familiarity from low-level visual differences in complex foraging tasks.
Keywords: Hybrid Foraging, Visual Search, Object processing, Face processing, Familiarity