Beta and mu suppression in the experimental conditions.

<p>Bars represent the mean power in the beta (14-21Hz) and mu frequency bands (7.5-12Hz) during the three conditions (Production, Vocal melody perception, Non-vocal melody perception), over the power in the baseline, for the fronto-central, centro-parietal and parieto-occipital regions. Data from the left and right hemispheres are averaged. Error bars indicate the standard error of the mean and asterisks correspond to the significant differences (p<.05) between conditions (Bottom: Production versus Perception, Top: Vocal melodies versus Non-vocal melodies), according to Tukey’s HSD post-hoc tests. Note that differences between vocal and non-vocal in the beta band were only significant over left fronto-central electrodes.