Hi Maria,
I'm not sure if you're talking about the first level (single subject) model or the second level (group) model, so I'll give a stab at both. At the single subject level, I you would enter a parametric modulation for both of your variables, and when making contrasts, you would put a "1" over your variable of interest (psych-variable-1) and a "0" over the variable you want to covary for (psych-variable-2). At the group level, you create a multiple regression model, enter your two variables as regressors, and put a "1" over your variable of interest and a "0" over the variable you want to covary for. I'm pretty sure I'm right on this one, but somebody can correct me if I'm wrong. Hope this helps!
Dani
Daniel Simmonds
Developmental Cognitive Neurology
Kennedy Krieger Institute
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>>> Maria Densmore <[log in to unmask]> 7/9/2007 9:42 AM >>>
Hello spmers,
Using fMRI data I am trying to show the relationship between
PSYCH-variable-1 and the BOLD AFTER covarying for PSYCH-variable-2. I'm
not sure which analysis to use.
I asked this question a couple of weeks ago and didn't receive a response.
I am now wording it more clearly, hope this will generate a helpful
response.
Thanks for your attention.
Maria Densmore B.Sc.
Imaging Division
Lawson Health Research Institute
St. Joseph's Health Care
London Ontario Canada
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