(A) The buccal and upper marginal branches of the facial motor nerve were severed unilaterally, preventing whisker motion on the right side of the face. Adapted from Heaton et al., 2014. (B) Motion energy of the left (intact) and right (paralyzed) sides of the face, averaged over 3 min of video. Nerve cut greatly reduced the motion of both the whiskers and mystacial pad. (C) Example POm cell (top, black), ipsilateral (left side of face) whiskers (bottom, blue), and contralateral whiskers (bottom, gray). Blue boxes: periods of whisking as in Figure 1B. (D) Scatter plot of mean POm firing rate during whisking and quiescence. Blue, example cell in (B). Firing rates during whisking are significantly higher than quiescence (n=12 cells from two animals, quiescent mean: 11.6 Hz, whisking mean: 16.7 Hz, 44% change, p=0.0007, paired t-test). (E) Cross-correlation of POm firing rate and ipsilateral whisking amplitude. (F) Polar plot of modulation depth and preferred phase of each POm unit as in Figure 1E. Filled circles, cells with significant phase modulation (p<0.05, Kuiper test, Bonferroni corrected). (G) Modulation depth of POm cells in intact mice (green, as in Figure 1E) and after buccal nerve cut (blue). There was a significant difference in the variance of modulation depth between groups (p=0.0013, two-sample F-test).