2つの顔の平均顔を同定できるか―顔のアンサンブル知覚の検討―

抄録

Literature suggests observers can extract an average of facial expressions or attractiveness of multiple faces presented simultaneously. This phenomenon is called “ensemble perception.” However, it is unclear whether observers identify the averaged appearance of faces in ensemble perception. To address this, we conducted two experiments where participants studied a set of two different faces as targets and were then asked to judge whether the test face was an average of the two targets. We prepared three types of test faces: an averaged face using the two targets (T2),an averaged face using the target and non-target faces (TN),and an averaged face using two non-target faces (N2). In both experiments, participants correctly judged T2 as targets as opposed to N2. However, participants could discriminate T2 from TN only in Experiment 2, where correct or incorrect feedback at each trial was provided. These results suggest that observers can identify an averaged face from two targets but discriminate the averaged one from others only when facilitated by feedback.