We are trying to mimic SPM results using afni. The group I am working with
uses the default value for SPM's high-pass filter (cutoff period of 128 seconds) so I
would like to do the same using 3dFourier, but when I type the command
> 3dFourier -highpass .008 -prefix outputFile inputFile
I receive the following error:
> Error in 3dFourier:
> Highpass filter is an all-pass filter since Fc is too small.
The brik file I am using has 400 volumes with a TR of 2.5.
John