Dear SPM Community,
We're working on an fMRI study with SPM8 and was wondering how to add
a covariate to control for hunger levels.
In our experiment, we showed food pictures to each subject during each
run. Before each run we also asked subjects to rate their hunger
between 0 and 20. We want to include these hunger ratings as a
covariate because we think their hunger confounds the data, but we're
not sure where these hunger ratings belong in the first-level
analysis. We figure as a regressor, but we're not confident about this!
Thanks for any help!
Deborah & Marie
Deborah Tang, Doctoral Candidate
McGill University
Montreal Neurological Institute
3801 University St, Room WB 214D
Montreal, QC H3A 2B4
Canada
Phone: (514) 398-6644 Ext. 089469
Fax: (514) 398-8948
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