Figure 1.

(A) Movement tasks. The figure depicted an example of the execution of the Lip Stretching (at the left) and Lip Protrusion (at the right) movements that participants had to perform in response to experimental stimuli. (B) Experimental Stimuli. In the upper part are presented mouth-closing orofacial gestures with positive (a) and negative (b) value. At the center, positive (c) and negative (d) mouth-opening orofacial gestures are presented. Meaningless closing-mouth (e) and opening-mouth (f) gestures are depicted at the bottom. The same stimuli executed by a male actor were presented during the experiment.