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
September 24, 2012 04:43PM
> Our approach is to specify 7 stime files for the 6 task levels and the control
> condition. Then, we perform 6 GLM contrasts on each level vs. the scramble
> image control condition. The beta-coefficients of these contrasts are tested
> for differences.

This seems reasonable to me.

> A collaborator thinks there may be an alternate mechanism for specifying our
> scramble control condition (i.e., one that obviates the need for the 6 GLM
> contrasts) and/or that specifying it with an stime file is inappropriate.

It is not clear to me what the concern is about the control condition. What is considered inappropriate, neurologically or from modeling perspective?

Gang
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Subject Author Posted

Specifying a Baseline Condition

Anonymous User September 24, 2012 02:42PM

Re: Specifying a Baseline Condition

gang September 24, 2012 04:43PM

Re: Specifying a Baseline Condition

Maria September 24, 2012 05:14PM

Re: Specifying a Baseline Condition

rick reynolds September 25, 2012 09:42AM

Re: Specifying a Baseline Condition

Anonymous User September 26, 2012 03:01PM