Figure 2.
A, B, Group (mean ± SEM) MEP amplitude for APB (A) and FDI (B) before (pre-PAS) and after (post-PAS) paired associative stimulation. Data are from morning experiments (am) on the left, and evening (pm) experiments on the right. APB MEP amplitude was significantly larger post-PAS than pre-PAS in the evening session (*p < 0.001), but not in the morning. APB MEP amplitude post-PAS was significantly greater in the evening than in the morning (#p < 0.001). FDI MEP amplitude (B) was not affected by PAS or time of day.