Fig. 3.

Short-interval intracortical inhibition (SICI) in the right primary motor cortex recorded from the left FCR. A higher value means less SICI. A: representative trace of MEPs of a single participant; each tracing comprises 1 trial. Solid line, control MEP; dotted line, conditioned MEP illustrating SICI. B: mean (±SD) % of SICI relative to control. Horizontal dashed line at 100% represents the control value, i.e., absence of inhibition or facilitation. C: individual % difference of SICI between the mirror and no-mirror condition at rest (white bars) and during contraction (black bars). A positive value means a mirror image induced reduction of SICI, whereas a negative value means a mirror image induced increase of SICI. *Significantly different from SICI in all other conditions (P < 0.05; n = 27).