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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B. Douglas Ward
November 22, 2002 02:18PM

Hello Lukas:

The two GLT's that you listed are performing two different statistical tests.
The first GLT is testing whether the AUC's for the stimuli are equal.
The second GLT is testing whether the individual IRF coefficients are equal.

Since the GLT's are testing different hypotheses, I don't know of a theoretical
reason for preferring one to the other. In most cases they should yield
similar results (when thresholded at the same p-level).

The first test creates a single GLT coefficient, representing the difference
in response, whereas the second test creates 4 GLT coefficients. Having a
single number to represent the result may make it easier to combine results
across multiple subjects, which would argue in favor the first test.

Doug Ward
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Subject Author Posted

Contrast confusion

Lukas Pezawas November 20, 2002 01:50PM

Re: Contrast confusion

B. Douglas Ward November 22, 2002 02:18PM