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Dear All, is there a possibility to compute weighted averages (or something similar) at the first level in the eeg analysis, e.g. to incorporate further regressors or to regress out the variance explained by a continous variable across trials like it is done in spm designs in the fmri analysis? I found the line [115] c = c./sum(c); % vector of trial-wise weights in spm_eeg_average and think this might be something I'm looking for, but I'm not sure if this is correct. Could anyone help? Thanks, Lars Dr. Lars Kuchinke Freie Universität Berlin Allgemeine Psychologie Habelschwerdter Allee 45 14195 Berlin [log in to unmask] www.fu-berlin.de/allgpsy www.fu-berlin.de/loe