Fig. 3.

A) Scatter plots of centre frequency for the alpha and beta range in relation to age. Significance values from the regression analyses are shown (asterisk indicates significance after Bonferroni correction). Age was found to significantly predict alpha, but not beta, centre frequency. B) Spectral power plotted in relation to centre frequency for the alpha and beta frequency ranges. Topographic plots show the average power distribution for each of the eyes open and eyes closed recordings for the alpha and beta frequency ranges. Star indicates the electrode used for obtaining the power and centre frequency values used in the analyses (alpha = POz electrode, beta = FCz electrode).