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No. Intensity drifts over time would be modelled by the high-pass filter in the GLM, which would fit a few cosine basis functions to the data, in addition to the various other effects that would typically be included in the design matrix. Alternatively, if you just want to model out linear effects with time, you could disable the high-pass filtering and include an additional covariate of (1:N)-N/2 in the design matrix. Best regards, -John On 30 May 2012 17:05, Kluetsch, Rosemarie <[log in to unmask]> wrote: > Dear SPM users, > > > > I was wondering whether SPM8 performs any automatic temporal filtering > (e.g., removal of linear signal drifts) during the pre-processing stages? > > > > Thanks a lot in advance, > > Rosemarie > > > > > > Rosemarie Klütsch, Dipl.-Psych. > > Doktorandin Klinische Forschergruppe 256 > > Klinik für Psychosomatik und Psychotherapeutische Medizin > > Zentralinstitut für Seelische Gesundheit > > J 5 > > 68159 Mannheim > > Tel.: 0621-1703-4462 > > > > Central Institute of Mental Health > > J 5 > > D-68159 Mannheim > > Germany > > phone: +49-621-1703-4462 > > fax: +49-621-1703-4405 > >