Hi all
I am doing a region of interest analysis: I extract the average signal from each ROI and import it (to excel). Before calculating the correlation with my reference waveform, I would like to detrend the signal the same way FIM+ (and Fbuc I guess) does and I wonder what the best way would be and how to do it exactly:
- Should I detrend the average signal from the ROIs using 3dDeconvolve? To do that, is such a command the right way to do it? :
3dDeconvolve -input1D ROI_average.1D -num_stimts 0
- Or should I detrend the BRIK before extracting the average ROI signal using 3dDeconvolve or 3dDetrend?
I tried to use 3dDetrend but got confused about which –expr to use. I have tried -expr '1' -expr 't' -expr 't*t', which is supposed to remove a quadratic trend from the data but is that what Fim+ does?
Is the command for using 3dDeconvolve something like that?
3dDeconvolve –input subject_3d+time.BRIK –num_stimts 0
Or maybe there is still another way that would be better?
Any advice will be greatly welcome. Thanks a lot!
Barbara
