Figure 2.

Somatosensory demands modulate muscular beta oscillations. A, B, Modulations of muscular beta oscillations by lateralized tactile anticipation (A) and tactile stimulation (B). Modulations are expressed as the difference between EMG recorded on the hand ipsilateral and contralateral to the (expected) event (ipsilateral − contralateral, expressed as a percentage change). Compare with the contralateral − ipsilateral contrasts in the MEG data from the primary somatomotor cortices (see van Ede et al., 2011, their Figs. 2A, Supplementary Fig. 5A, respectively). Middle, Time courses of these contrasts for extracted beta-band power. Solid gray lines indicate significant clusters (see Materials and Methods). Dotted gray lines indicate the null hypothesis of no difference between contralateral and ipsilateral EMG. Bottom, Changes in muscle tone (high-pass-filtered and rectified EMG). Blue shadings represent ± 1 SEM. Data are from Experiment 1.