Fig. 1
Representative electromyography waveforms for arm movement acceleration, wrist position, center of pressure in the anteroposterior direction (CoPap), and visual stimulus. AD, anterior deltoid; RA, rectus abdominis; ES, erector spinae; RF, rectus femoris; BF, biceps femoris; TA, tibialis anterior; GcM, gastrocnemius medialis; SOL, soleus. Dashed lines indicate stimulus onset (left), AD burst onset (middle), and end point of arm movement (right). Straight arrows indicate burst onset of activation of the postural muscles and onset of arm movement