ERPs were analyzed by considering mean amplitude values.
For each of these seeds, the mean amplitude values were extracted separately for each individual subject.
For statistical analysis, mean amplitude values were computed for four regions of interest (ROIs): left anterior (F7, F3, FT7, FC3), right anterior (F8, F4, FT8, FC4), left posterior (C3, CP5, P7, P3) and right posterior (C4, CP6, P4, P8).
The specific clusters that we used can be seen in Figure 2. We created four time-bins, based upon the preceding literature, and compared the mean amplitude values across each bin.
For statistical analysis, mean amplitude values within a time window from 160 to 200 ms (centred around the ERAN peak) were calculated for 4 Regions of Interest (ROIs; see also inset of Figure 3B): left anterior (AF3, F7, F3, FT7, FC3), right anterior (AF4, F8, F4, FT8, FC4), left posterior (T7, C3, CP5, P7, P3), and right posterior (T8, C4, CP6, P8, P4).
Mean amplitude values for standard and deviant ERPs were extracted.
The mean amplitude value decreases with increasing pre-strain.
The mean amplitude value of bR-MEPs for the control group was 4.4 ± 1.9 mV on the non-preferred side and 4.7 ± 2.1 mV contralaterally.
For statistical extraction an adaptive mean amplitude value was used and the extraction was limited to 18 occipital-temporal channels in each hemisphere.
Non-stationary noise analysis indicated an increase in the variance at the largest change from the mean amplitude value (Fig. 4D), suggesting an increase in the number of AMPA receptors present at the synapse.
Additionally, we smoothed the images with a 6 mm FWHM kernel and converted the time-series of each voxel to percent signal change by subtracting and dividing by their mean amplitude value over time.
