Figure 2.
Evoked spinal responses by stimulation in M1 versus PM sites. a, Examples of three spinal sites in which responses were evoked by stimulation in M1 (green traces) and/or premotor cortex (brown traces). In all three cases, the M1 and premotor sites were recorded simultaneously in parallel to the spinal recordings. In one case (right-most example), both cortical sites evoked a significant spinal response. b, M1 sites had a significantly higher tendency to evoke spinal response than PM sites (χ2 test, p < 0.01). c, No significant differences were found in the dorsal-to-ventral (DV) depth of spinal sites responding to M1 and PM stimulation.