What it is
The authors propose that facial-emotion recognition is ambiguity-gated: the system draws on sensorimotor (facial-motor) information mainly when visual evidence is insufficient, with early motor experience setting the threshold and gain of that contribution. They tested this across three studies (N = 185) using dynamic prototypical and nonprototypical expressions, congenital (Moebius syndrome) and acquired facial palsy, and standardized severity grading. Neurotypical adults (N = 117) showed a robust cost for less prototypical expressions, and both the congenital (N = 15) and acquired (N = 19) palsy cohorts showed severity coupled to performance for nonprototypical expressions, while only the Moebius cohort showed that coupling for prototypical expressions too.
Why it matters
Whether recognizing facial emotion is purely visual or also recruits the observer's own facial-motor circuits is a long-standing divide. Facial palsy, both congenital and acquired, offers a natural way to reduce facial motor function and test the embodied account, and the graded coupling between palsy severity and recognition of ambiguous expressions supports a model in which sensorimotor information is recruited mainly when visual evidence is weak. The Moebius-specific extension to prototypical expressions further suggests that lifelong atypical motor experience can leave visual templates undercalibrated.
Underlined numbers link to their source. Every metric and quoted figure is listed under Sources and data below.
Filed underFace Recognition and Perception, Action Observation and Synchronization, Emotion and Mood Recognition