Figure 5

PLS analysis results for the general aging effect on SPD (using the pre-training resting state in our two age-groups). (Top) The bar graph depicts the contrast between age-groups that was significantly expressed across electrodes and frequencies as determined by permutation tests, with erros bars denoting 95% confidence intervals. (Bottom) The bootstrap ratio map) illustrates the electrodes and frequencies at which the contrast displayed in the bar graphs was most stable. Values represent the ratio of the individual electrode weights and the bootstrap-derived standard error (roughly z scores, thresholded at 2.0 which corresponds approximately to p < 0.05). Positive values are plotted in warm colours and indicate frequencies and electrodes showing decreases from young to old age-group in resting state SPD. Negative values are plotted in cool colours and denote increases from young to old age-group in resting state SPD.