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
March 20, 2008 05:57PM
Silvia,

The beta value for the modulating variable is not percent signal change. Instead it is a kind of slope of the modulating effect relative to the percent signal change of BOLD response.

Whether you need to normalize the modulating effect depends on whether the emotional valence is comparable across subjects. For example, does a valence of 5 for one subject mean the same thing for another subject? If not, normalization within each subject might be desirable before you take those slopes for group analysis.

Gang
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Subject Author Posted

group analysis with amplitude modulation

Silvia Casarotto March 20, 2008 12:20PM

Re: group analysis with amplitude modulation

Gang Chen March 20, 2008 05:57PM

Re: group analysis with amplitude modulation

Silvia Casarotto March 21, 2008 07:29AM

Re: group analysis with amplitude modulation

Gang Chen March 24, 2008 03:31PM