In summary, the pattern of increase of correlations between ERO power measures was different in intramodal correlations compared to intermodal correlations. For the intramodal correlations the increase is from age 12 to age 25 which occurs in 5 of the 6 intramodal pairs in one (3 pairs) or both (2 pairs) of the genders but in only one of the 9 intermodal pairs in one gender. For the intermodal correlations the increase is not from age 12 but begins at some age between 17 and 20, when a minimum value occurs, to age 25 in 8 of the 9 intermodal pairs; this pattern occurs in one (2 pairs) or both (6 pairs) of the genders in the intermodal pairs but in only one of the intramodal pairs. The uniformity within both the intramodal correlation trajectories and the intermodal correlation trajectories combined with the difference between intramodal and intermodal correlation trajectories suggest a significant divergence in developmental pattern between the auditory and visual systems from age 16 to age 20 followed by a reconvergence. (We note the somewhat anomalous behavior of
