Figure 2

Regional body map for wrists, showing activity patterns across individual muscles. A: Overview of assessed muscles, color-coded by group. Targeted groups were: wrist extensors–-extensor carpi radialis; wrist flexors: flexor carpi radialis. B: Summary of channel-level representation of each muscle by brain area (M1: motor cortex arrays; S1: sensory cortex arrays) and laterality (contralateral, ipsilateral, or both). Counts are raw numbers, and percentages are with respect to all channels active for that region within the indicated brain area. C Activity maps for right hemisphere (MA: motor array, pedestal A; MB: motor array, pedestal B; SA: sensory array, pedestal A; SB: sensory array, pedestal B) and left hemisphere (MC: motor array, pedestal C; SC: sensory array, pedestal C). Channels with significant MUA responses to contractions in a body region are colored as in panel A. Solid colors indicate activity for only the contralateral side of the body (right side for MA/SA/MB/SB, left side for MC/SC); diagonal lines denote activity for the ipsilateral side; and black triangle overlays denote that both sides of the body elicited a response.