3. Results

3.1. Electrophysiological results

3.1.1. Experiment 1 

The evoked responses of all conditions can be observed in Figure 1a. It shows that the evocation of the components P2, N270, N400 and P1000. Upon closer inspection of these waveforms it can be seen that the amplitude of the late positive potential observed around 1000ms differentiate between linguistic and non-linguistic visual stimuli. Particularly, the amplitude in alveolar syllables was significantly higher compared with still-mouth and orofacial gestures in electrode FCz (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).