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Dear Rik, Yes, just use a parametric modulation with a rating value per trial. Then form a t-contrast on the parametric modulation regressor and enter the contrast images (one per subject) to a second level one-sample t-test. Best regards, Guillaume. On 07/08/17 14:51, Rik Sijben wrote: > Dear SPM'ers > > I have a data set from a study in which participants were presented stimuli of 5 conditions. After each stimulus they provided a rating on a 100 point scale. I'm trying to find out whether activation of certain regions during stimulus perception correlates with the rating they provided on the scale. > > How would I proceed to properly model this? Running a multiple regression at the first level requires a single value per scan rather than per trial while adding covariates at the second level doesn't allow me to differentiate between trials. Would a parametric modulation be valid for this? I'm more used to seeing it for ordinal differences within a condition rather than a 100 point scale. > > Thank you for any help you can offer on this. > > R. Sijben > -- Guillaume Flandin, PhD Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG