Figure 4

EEG power spectra during a dual-task static test (0%) and dynamic (core board) test in the elderly. Median values computed for the elderly for each ROI are represented by a sphere centered on the cortical region, whose radius is linearly related to power spectrum magnitude. Such information for panels (a) and (b) is also coded through a color scale titled “\(\Delta\) relative spectral power”. We reported the difference (\(\Delta\)) of the power spectra between the 0.5 s-epoch post-odd stimulus and the 0.5 s-epoch pre-odd stimulus in the same postural conditions of Fig. 3. The p-values showing statistically significant differences between (a) and (b) condition are reported in (c). Each P < 0.05 is represented by a sphere centered on the cortical region, whose radius is linearly related to the magnitude, also coded using a color scale titled “P-values”.