Fig. 3
Time course of the grand average ∆Hboxy signal measured from channel 21. The normalized ∆Hboxy data collected from channel 21 during the motor task were averaged across all subjects and represented by a solid line. The color of the solid line indicates the level of voluntary muscle contraction (0, 50, and 100% MVC). For the purpose of comparison, the previously published data for males (Fig. 5A in [13]) were superimposed as dashed lines. The start and end of voluntary muscle contraction were indicated by the vertical dotted lines (black). The baseline corrected for the ∆Hboxy signal was indicated by the horizontal solid line (black)