Mean (SD) of short interval intracortical inhibition (SICI) under multiple interstimulus intervals (ISI) before (Pre, solid) and after (Post, dashed) 1-Hz rTMS (N=15). Significant Time effect was revealed (p=0.0001), suggesting a reduction of inhibition after low-frequency rTMS. Post-hoc analysis revealed no significant differences at any individual ISI, indicating that SICI decreased, however, remained the same if measured at a specific ISI after low-frequency rTMS.