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
January 10, 2017 10:07AM
> But then there is only one RT (the average) per condition for each subject. So that makes
> only four data points per subject to adjust for between-subject variability in RT. Isn't that too little?

That should be fine. It's the number of subjects that matters the most.

> isn't it problematic that both Cond and RT are used as predictors but they are highly correlated?

By being "highly correlated", do you mean that the average RT for one condition is higher than the other? If so, the centering strategy I mentioned previously (centering within each condition) should take care of the issue in addition to maintaining the interpretation integrity of the condition effect.

Gang
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Subject Author Posted

RT as a random effect in LME for fMRI data?

Galit January 09, 2017 08:09AM

Re: RT as a random effect in LME for fMRI data?

gang January 09, 2017 10:34AM

Re: RT as a random effect in LME for fMRI data?

Galit January 10, 2017 04:09AM

Re: RT as a random effect in LME for fMRI data?

gang January 10, 2017 10:07AM

Re: RT as a random effect in LME for fMRI data?

Galit January 15, 2017 04:27AM

Re: RT as a random effect in LME for fMRI data?

gang January 17, 2017 09:01AM

Re: RT as a random effect in LME for fMRI data?

Galit January 18, 2017 08:14AM

Re: RT as a random effect in LME for fMRI data?

gang January 18, 2017 04:18PM