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(A,B) Time–frequency (TF) analysis in the 5- to 49-Hz frequency range, grand average across subjects in the voluntary situation (−1000 to +500 ms). (A) M1L, left primary motor cortex. (B) M1R, right primary motor cortex. A transient diminution in the 10- to 13-Hz frequency range occurred for M1L and M1R just before T0 and during unloading.
