difference between converters and nonconverters (F[1,39] = 2.26, p = .14). This pattern of group differences was confirmed by the non-parametric ADF test, although converters also differed significantly from nonconverters in the Welch-James test statistic (W/J[1,6.415] = 9.48, p = .02). In other words, the three converters were a main contributor for the overall group difference in alpha ERD between CHR patients and controls. This absence of alpha ERD in converters becomes particularly apparent when using the factor loadings as a basis for comparison (contour lines in Fig. 8B). We also note that ERS as measured by factor 260–1 was mostly present in these three individuals at delta frequencies, particularly for novels, but there was clearly a less robust extension of this ERS into the alpha spectrum.
