To present fully the characteristics of the developmental trajectories, as mentioned at the beginning of Section 2.3.1, three different visual representations are employed in Figure 1: in the top row the values are plotted to compare the trajectories themselves; in the middle row the relative values are plotted to compare the shapes of the trajectories without regard to levels of value; in the bottom row the rates of change of the trajectories are plotted to explicitly represent the size of the changes in the trajectories. The top row of Figure 1 shows the estimated means of the log transformed ERO power. Although male and female trajectories are different, the relation between electrode locations does not differ between males and females: the difference between the posterior channel (Pz) compared to central (Cz) and frontal (Fz) channels is similar in males and females. To emphasize the difference in the shapes, in contrast to the sizes, of the trajectories of males and females the data is also presented in the form of relative values in the middle row: each trajectory is rescaled and
