highly significantp<0.001
Amplitude decrease In Fig 4 (panel A), the cumulative plot of average H-reflex amplitude data points from all subjects of the semi-implicit condition (tell hand position when the LED light was last flashed) aligned after time normalization, was fitted with a common sinewave function with the same period as that fitting the average movement (panel B; R 2 , = 0.99, p<0.0001), and sinusoidal H-reflex modulation was highly significant (R 2 = 0.19, p<0.001).