Fig. 4.

Pairwise age group contrasts for each scalp electrode and frequency. Cold colors (blue) indicate less spectral power (dB) in the older group of a given contrast (e.g., 9 vs 13), masked by significance using Threshold Free Cluster Enhancement with 2000 random between-subjects permutations. Shaded backgrounds for age group contrasts within pre-teen years (pink), between pre-teen and teen years (blue), and within teen years (grey). Note: F – frontal; C – central; PO – parieto-occipital. L – left hemisphere; R – right hemisphere. N.S. – no significant contrasts (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.).