Hi Chin
I wrote something to do just what you want; see the attached file and
the following:
Macey PM, Macey KE, Kumar R, and Harper RM. A method for removal of
global effects from fMRI time series. Neuroimage 22: 360-366, 2004.
Save the file to your spm folder and enter "cspm_lmgs" to run it.
Best wishes,
Paul
chin wei wrote:
> Hi all.
>
> I have a fMRI dataset. There is significant correlation between the
> global mean time series of the dataset and my experimental condition.
> How can I do for these dataset? I want to get rid of the global mean
> signal by subtracting it voxel by voxel during the preprocessing
> period. Does it work? Please give some advice. Thank you in advance
>
>
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