Stimulus-locked CSD waveforms (384 sample points spanning the time interval from −100 to 1,395 ms around stimulus-onset) were submitted to temporal PCA (MatLab emulation of BMDP-4M algorithms; cf. appendix of Kayser and Tenke, 2003), with an input data matrix consisting of 384 variables and 27,068 observations stemming from 101 participants, 4 conditions (new/old items for word and face tasks) and 67 electrode sites, including the nose.
