temporal resolution while resulting in the smoothing of estimates and a more complex interpretation of the results. Since there are 4 SNPs and 6 phenotypes (3 scalp locations: Fz, Cz, Pz × 2 modalities: auditory and visual) there are 24 association trajectories for each sex, each with 131 points. The calculation of the association trajectories provides a new set of data which is then subject to statistical analysis to determine its own pattern of age variation and sex specificity across the range of phenotypes.