Figure 3
From: The influence of methylphenidate on the power spectrum of ADHD children – an MEG study
Difference of global power – MPH minus Placebo. The difference of the grand average global and relative power (delta, theta, alpha, beta, and gamma) between the MPH condition and the placebo condition calculated over the 35 subjects. It can clearly be seen that the global power is strongest over frontal regions (global power is given in ft/vHz. Delta, Theta, Alpha, Beta and Gamma are relative measures, normalized to the Global power. Theta/Alpha and Theta/Beta are ratios of the relative power, which is identical to ratios of the power).