Hello,
We have a design with several task related EVs for which we have turned
on the temporal derivative option. Because our motion correction was
handled outside of FEAT, we have chosen to explicitly describe them in
the model as additional EVs (rather than use the motion regression
checkbox). We plan to set our task related EVs to be orthogonal to the
motion regressor EVs. Does the orthogonality option only apply to the
original EVs, or does it also apply to the temporal derivatives of our
task EVs as well? If the temporal derivatives are not orthogonalized to
the motion EVs, is there a way to do so?
Thanks,
Amanda
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Amanda Bischoff-Grethe, PhD
Assistant Project Scientist
Laboratory of Cognitive Imaging
VA San Diego Healthcare System
3350 La Jolla Village Drive, M/C 151B
San Diego, CA 92161
Phone: 858-552-8585 x2480
Fax: 858-642-1458
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