AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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nick
July 17, 2014 12:36PM
Jeremy Wrote:
-------------------------------------------------------
> Hi everyone!
> Normalize: 3dcalc -gscale -datum float -prefix
> func_normalized -a func_+orig -b mean+orig -expr
> "a/b*100"
> The normalize I mean is to let the functional
> data to divide the mean value of themselves.
> I want to know if it is necessary to do it so
> that every subject are at the same level before I
> do the 3dDeconvolve.

Yes, that's generally advised. Mean intensity can vary over runs, and this normalization step can help in correcting that.
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Subject Author Posted

Should I need to normalize the functional data before 3dDeconvolve?

Jeremy July 17, 2014 12:05PM

Re: Should I need to normalize the functional data before 3dDeconvolve?

nick July 17, 2014 12:36PM