Dear SPM users,
I am putting together a within subjects first level design and was hoping for some guidance. From my understanding, one can choose from factorial or parametric designs. I am interested at looking at a within subjects variable (condition) with three levels. Furthermore, each of these conditions is rated according to a 3 point (1,2,3) linear scale. I have attached the parametric design that I have created so far. Does it look correct?
I am particularly interested in the association between 'think' condition and rating i.e. does activation change during the 'think' condition depending on the type of rating? Would the following contrasts be correct:
positive: 0 1 0 0 0 0
negative: 0 -1 0 0 0 0
I am also having trouble setting up the same design using factorial model. How do I make sure that my time stamps for image (stimuli within each of 3 conditions) presentation correspond to the rating for that image?
Any help would be greatly appreciated!
Many Thanks,
Aleks
|