Particularly, the amplitude in alveolar syllables was significantly higher compared with still-mouth and orofacial gestures (t=-3.392, p=0.0148, ETA and t=3.593, p=0.0076, ETA respectively). Moreover, the topographical representations for syllables and backward syllables notably differ from those of still-mouth and non-linguistic gestures. The former ones were associated with a centro-frontal activity while the activity of the latter ones were more located in posterior-occipital regions (Fig.1b).