has not been explained in the study; and 4) ERP waveforms are filtered with successive 40-Hz and 7 Hz low pass filters at 24 dB, and the noise evident in these (heavily-smoothed) waveforms adversely impact on the CSD transform (order of splines used in the spherical spline model: m = 4, only 20 iterations, no lambda mentioned). For these reasons, this study is limited in its effectiveness as an implementation of the CSD method.
