Fig. 3

The spatial distribution of electrically elicited responses in tibialis anterior. Mean and standard deviation (whiskers; N = 10 subjects) are shown for the peak-to-peak amplitude of M waves (a), averaged across channels, the number of active channels (b) and the barycentre transverse (c) and longitudinal coordinates (d) within the grid. Different grey intensities indicate the three ankle positions tested: dorsiflexion (grey), neutral (light grey) and plantar flexion (dark grey). Values obtained for 50% and 100% of the maximal stimulation intensity are shown from top to bottom in panel c and from left to right in panels a, b and d. Asterisks denote statistical significance at 5%