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

History of AFNI updates  

Previous Message Next Message
Message List New Topic Print View
|
archerdb
March 17, 2016 05:52PM
Hello Y'all,

I'm doing a pain experiment in the scanner in block design. The subject first rates his resting pain, then experiences an external pain eliciting stimulus, then rates that pain on a 0 to 10 scale, then he rests, and then rates this resting pain and so on. So, the design looks like this:
rest rate1 pain rate2
rest rate1 pain rate2 ...

The problem is that a small residual pain lasts beyond the task and extends into the rest period. And this residual pain seems to increase after each block. So, the pain rating right after 'rest' keeps increasing with the blocks.

What will be the best way to control for the residual pain in the fMRI analysis? I can covary out the rating during rate1 but is there a simpler or better way?

Thanks and regards,
G
Reply Quote
RSS
Subject Author Posted

controlling for a confound

archerdb March 17, 2016 05:52PM

Re: controlling for a confound

gang March 18, 2016 11:46AM