Within-limb somatotopy in primary motor cortex - revealed using fMRI

Somatotopic gradients exist in M1 despite the overlap. This finding supports 'functional somatotopy', i.e., within-limb representations overlap for multi-joint coordination, yet possess discrete centers for individuated control. Such a flexible somatotopy might allow representational reorganization. COM could be marker for 'location' and POA within in a high-intensity zone could emphasize 'reorganization' following learning/disease. Also, fMRI intensity could be a marker of change of overlap or somatotopic distinction.