Dear all,
Is there a way to find the additional effect of two regressors? I am
trying with an F contrast as explained here:
https://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind05&L=SPM&D=0&X=55F9574699495D1722&P=816291
but results are not what I want. Areas significant on A alone, are not
present anymore at the F-contrast.
How can I obtain maps of the joint contribution of both A and B? They
represent two measures of the same factor in a parametric modulation,
which I want to group and compare with another factor.
Thank you.
Dorian.
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