Constant and linear functions were found to be sufficient for modeling of the developmental changes in P300 amplitude within the age ranges considered. Based on the BIC goodness of fit measure, trajectory groups were identified. Two groups characterized the majority of subjects in the 8–12 age range, though a small third group (N=9) with the highest P300 was seen. Three groups characterized the majority of subjects in the 13–18, and 19–29 age ranges. BIC values supporting the resulting trajectory classes studied are shown in Table 3 with the trajectory models illustrated in Figures 1 and 2.
