Figure 7

Motor-evoked potentials. Mean (± SE) normalised motor-evoked potential (MEP) amplitudes (N = 16) as a function of time and precued direction, for the abductor pollicis brevis (A), first dorsal interosseus (B), and flexor carpi radialis (C) of the moving hand. Baseline, preparatory, and response intervals are marked by light, medium, or dark grey background, respectively (see Figure 1). In (A) the stars denote the significance level of omnibus F-test (one-way ANOVA), the corresponding post-hoc comparisons are specified in Table 1. In (B) the stars denote the significance levels of post-hoc comparisons. *p < 0.05, **p < 0.01, and ***p < 0.001. The MEP amplitudes in the APB and the FDI were significantly modulated during the preparatory and the response interval. For the APB, there was a significant effect of the precued direction at -100 ms and 250 ms (see Table 1). The MEPs of the FDI were not differentially modulated by the precue, but generally decreased over time. The MEP amplitudes in the FCR did not change significantly.