Fig. 2
Scatter plots showing the correlation between motor MLT and TES intensity. Considered are changes of MLT due to increases in TES-voltage. Motor latency differences ∆MLTn,i,m are plotted vertically and the TES-intensity is related to the motor threshold MT and plotted along the horizontal axis as VTES – MT. ∆MLTn,i,m is obtained after subtraction of the mean MLT, MLTi,m, from MLTn,i,m. n denotes case number, i is one of 6 data points per case and m refers to the muscle group. Each plot represents a muscle group: figures (a) and (b) refer to ECR: extensor carpi radialis muscle, respectively left and right. Figures: (c) and (d) refer to TC: tibial cranial muscle, respectively left and right. The parameters of the regression line with correlation and significance are specified in Table 2. All regression lines show decreasing courses with significant correlation