As detailed in Kayser and Tenke (2006b), event-related CSDs were submitted to a covariance-based PCA followed by unrestricted Varimax rotation of the covariance loadings (Matlab emulation of BMDP-4M published in the appendix of Kayser & Tenke, 2003). Data consisted of 308 time points as variables (− 200 to 1000 ms), using a total of 19,698 observations as cases consisting of three conditions (novel, target, nontarget), 98 participants, and 67 sites (electrode locations).
