Supplemental Figures

Two figures in PDF format.

Files in this Data Supplement:

• Figure S1 - Electromyographic activity of 12 recorded muscles for a typical right INC site of animal M2. The format is the same as that used in the Fig. 2. Here, torsional head posture is opposite compared to left INC (Fig. 2). However, the EMG results are similar to those for left INC when plotted with respect to their ipsilateral/contralateral location (relative to the INC site).
• Figure S2 - Pooled and normalized EMG values and standard errors for all the sites of both animals. Same format as in Fig. 3 but here the stimulation data represents the early (10-30 ms) post-stimulation period. Overall, the results are qualitatively similar but not quantitatively identical to those during late (100-200 ms) stimulation (Fig. 3). Panel A: During early stimulation, for most, but not all muscles, stimulation produced a facilitation of muscle activity (empty bars). Significant increases in EMG activity were observed in ipsi-SCM, ipsi-SP, ipsi-COM, ipsi-BC, contra-RCP maj., contra-OCI and contra-BC muscles (t-test, P < 0.05). Moreover, significant decreases were also observed in ipsi-OCI and contra-SCM muscles (t-test, P < 0.05). Opposite effects between stimulation and inactivation were observed in ipsi-OCI, contra-SCM, contra-RCPmaj. and contra-OCI muscles. Panels B-G: The correlation between inactivation versus early stimulation period provided similar results to that reported in the main text for the late stimulation data. The correlation coefficient (r) was higher in ipsi-SCM (m = 0.24, r = 0.61) than in contra-SCM muscle (m = 2.62, r = 0.46); in contra-SP (m = 0.45, r = 0.86) than in ipsi-SP muscle (m = 0.12, r = 0.16); in contra-RCPmaj. (m = 0.15, r = 0.71) than in ipsi-RCPmaj. muscle (m = 0.07, r = 0.05) and in contra-OCI (m = 0.05, r = 0.65) than in ipsi-OCI muscle (m = 0.15, r = 0.10) Both ipsilateral neck extensor neck muscles, COM and BC showed higher correlations than those in their contralateral pairs (ipsi-BC, m = 0.05, r = 0.58; contra-BC, m = 0.22, r = 0.18) and (ipsi-COM, m = 0.09, r = 0.68; contra-COM, m = 0.11, r = 0.22).