Facial muscles aid in interpreting others' emotions, study finds

Researchers from the University of Parma and the University of Padua have discovered that facial muscle movement plays a critical role in how humans interpret the emotions of others. The study, published in PNAS, suggests that the brain does not rely solely on visual input but also utilizes an internal simulation of facial movements to decipher emotional states.

To investigate this, scientists conducted experiments involving 185 participants, including individuals with congenital or acquired facial paralysis, such as those with Moebius syndrome. The research found that when facial expressions are ambiguous or difficult to interpret, individuals with greater residual facial mobility demonstrated a superior ability to recognize emotions.

This indicates that visual information and sensorimotor signals work together rather than as alternatives. The findings suggest that the brain may attempt to invisibly imitate the expressions of others to better understand them, highlighting the importance of the connection between the brain and the body's motor system in social cognition.