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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Gang Chen
February 26, 2004 02:15PM
Giuseppe,

Yes, normalization is usually a scaling process with the factor (usually the mean) different for reach voxel and for each run as well. Although smoothing is usually done before normalization, I believe that smoothing and normalization are indeed commutable. The reason is that spatial smoothing (or blurring) is achieved with the value at each voxel obtained through some weighted-average (i.e., Gaussian blurring) of its neighbors, and the weights are assigned based on its spatial distribution and have nothing to do with the time series at each voxel.

Gang
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Subject Author Posted

percent normalization and smoothing

giuseppe pagnoni February 26, 2004 01:50PM

Re: percent normalization and smoothing

Gang Chen February 26, 2004 02:15PM

Re: percent normalization and smoothing

giuseppe pagnoni February 26, 2004 03:04PM

Re: percent normalization and smoothing

Gang Chen February 26, 2004 04:10PM

Re: percent normalization and smoothing

rick reynolds February 26, 2004 05:03PM