Chunk #36 — Results — Further Examination of the Relationship between TF-PCA and Time-Domain Measures — Mean ERP amplitude within the time range defined by TF-PC3
amplitude within this time range to differentiate each diagnostic group from controls was compared to the ability of a model containing the peak energies, collectively, of the TF-PCA components that occurred within this same time range to do so (i.e. probit regression models containing either the time domain mean or PC 1, 3, and 5 peak energies were compared to a model containing all four of these measures). Thus, the collective time-domain information occurring in this time window was compared to the collective TF information occurring in this same window. First, this mean ERP measure alone accounted for slightly more variance in group membership than the traditional P3 peak amplitude, but less variance than did TF PC3 (see Table 3). Second, results show (see Table 4) that neither the mean ERP measure nor the group of TF-PCs within that time range accounted for any unique variance in group membership above and beyond the other (except the CD group, in which both measures accounted for the same, and some additional, variance). Thus, the same variance in group membership is accounted for by activity in both the time-domain and TF-PCA components residing in the time range defined by PC3.
