Figure 2. Effect of movement preparation and movement onset on the amplitude of MEP_APB and MEP_FDI.

MEPs are expressed as percentage of rest MEPs in the four different conditions (rest, T₁₀₀, T₅₀, T_peak), in controls (black) and patients (grey), during single-pulse TMS. A: A significant decrease of MEP_APB was observed in controls at T₅₀ and T_peak (surround inhibition) while patients exhibited no significant surround inhibition. * p< 0.05. B: Significant MEP_FDI amplitude increase was found in both groups at T₅₀ and T_peak (central excitation).