Movement Cues Aid Face Recognition in Developmental Prosopagnosia

Objective: Seeing a face in motion can improve face recognition in the general population, and studies of face matching indicate that people with face recognition difficulties (developmental prosopagnosia; DP) may be able to use movement cues as a supplementary strategy to help them process faces. However, the use of facial movement cues in DP has not been examined in the context of familiar face recognition. This study examined whether people with DP were better at recognising famous faces presented in motion, compared to static. Methods: Nine participants with DP and 14 age-matched controls completed a famous face recognition task. Each face was presented twice across two blocks: once in motion and once as a still image. Discriminability (A’) was calculated for each block. Results: Participants with DP showed a significant movement advantage overall. This was driven by a movement advantage in the first block, but not in the second block. Participants with DP were significantly worse than controls at identifying faces from static images, but there was no difference between DPs and controls for moving images. Conclusions: Seeing a familiar face in motion can improve face recognition in people with DP, at least in some circumstances. The mechanisms behind this effect are unclear, but these results suggest that some people with DP are able to learn and recognise patterns of facial motion, and movement can act as a useful cue when face recognition is impaired.