Figure 1.

Top: Sensorimotor control model, involving the primary motor cortex (MI) and the proprioceptive cortex (PI). Middle: Intact PI (left) and MI (right) maps. Letters indicate, for each neuron, the muscle groups of which that neuron encodes the activity (or stretch level). Bottom: PI (left) and MI (right) maps immediately after the lesion and after reorganization. Each map displays labels on all neurons (left) or only the neurons that are maximally activated by that muscle. From Goodall et al. (1997), reprinted with permission.