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EMG activity of the (a) corrugator supercilii and (b) zygomaticus major for each modality condition. Mean muscle activity (percentage of baseline) for each 500 ms time-window after stimulus onset. The error bar represents the standard error across participants. Asterisks represent statistically significant differences according to the Wilcoxon signed-rank tests with Bonferroni correction: **p < 0.01/18; *p < 0.05/18.
