Fig. 2.

Impact of movement initiation on the input-output recruitment curve of the surround muscle (abductor pollicis brevis, APB). Normalized motor evoked potential (MEP) amplitudes are plotted against stimulation intensity (represented as a percentage of motor threshold) at rest and during movement initiation for posteroanterior (PA), anteroposterior (AP), and lateromedial (LM) coil directions. A: recruitment curves at rest and during movement initiation for P-A direction. B: recruitment curves at rest and during movement initiation for A-P direction. C: recruitment curves at rest and during movement initiation for L-M direction. Symbols represent median values, and error bars indicate 25th and 75th interquartile range.