Fig. 4. Gain values of the three muscle pairs at the 1-Hz frequency. In the scatterplot of each muscle pair, the thick horizontal line represents the median, and the two thin horizontal lines represent the first and third quartile values, respectively. MS, superficial masseter muscle; TA, anterior portion of the temporalis muscle; DA, anterior belly of the digastric muscle; SM, sternocleidomastoid muscle. The “–” sign between two muscles indicates a pair of those two muscles. Friedman one-way ANOVA with post hoc Wilcoxon signed-rank test.
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