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Ganel and Goodale found in another study that smiling faces are perceived as older than neutral faces of the same individuals due to smile-associated wrinkles in the eye region critical for face ...
Actuators connected to the base allowed the face to move, with the living skin flexing. The researchers also covered a static 3D-printed head shape with the engineered skin.
In their study, participants rated smiling faces as as older than neutral faces, but afterwards, recalled the smiling faces as being younger than the neutral faces.