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Beta activity during sustained contraction was modulated by effort level and not by the motor effector. A, Group mean ± SEM (colored shaded areas) time evolving beta power aligned to force onset (0 s). The solid and dashed vertical lines indicate the time of force onset and the time to peak force rate, respectively. B, Group mean ± SEM beta power during the period of sustained contraction (taken from 1 to 2 s after the force onset; see Fig. 2).
