Starting with a timeseries of EPI data (all positive values)
I used the following 3dMerge line to blur the timeseries data:
3dmerge -doall -prefix $name.MTL.all.blur -1blur_rms 4 $name.MTL.all+orig.HEAD
For one of my subjects this line produces a blurred timeseries with negative values.
How can I get a negative value when all of the values in $name.MTL.all+orig.HEAD
are positive?
PSFB
p.s. another pitiful "quick question" from a neuroscientist.