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
|
gang
February 20, 2015 05:55PM
> It seems a block HRF would be more appropriate conceptually but I can't find it actually
> used anywhere so I'm wondering if I'm missing something with this PPI step?

No, a block HRF would not be appropriate. An impulse response (a response from a presumably instantaneous stimulus) is used in the deconvolution step to find the neuronal events. In the case of a block experiment, it is expected to find consecutive events within each block based on the deconvolution of the kernel function (impulse response). If you use a block HRF, you would most likely end up with one event for each block, which is associated with the stimulus timing (onset time) of the block.

Gang
Reply Quote
RSS
Subject Author Posted

PPI IRF ? for block design task

LJGD February 20, 2015 04:51PM

Re: PPI IRF ? for block design task

gang February 20, 2015 05:55PM

Re: PPI IRF ? for block design task

LJGD February 23, 2015 10:26AM