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
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