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 20, 2015 02:55PM
There are at least two factors that may impact on the selection of hemodynamic response (HDR) model:

(1) Experiment type: event-related or block design? In general, 'BLOCK(d,p)' is good enough most of the time for block designs while the following models can be used for event-related experiments: 'TENT(b,c,n)', 'CSPLIN(b,c,n)', 'GAM(p,q)', 'SPMG1', 'SPMG2', 'SPMG3'.

(2) Goal of the experiment: do you just want to detect the BOLD response amplitude? Do you care about subtle shape differences in HDR? With the former 'BLOCK(d,p)' and 'GAM' (or the SPM models) are probably good enough for event-related and block design respectively. If HDR shape subtleties are of interest, use 'TENT(b,c,n)' or 'CSPLIN(b,c,n)'.

Gang



Edited 1 time(s). Last edit at 01/20/2015 03:32PM by Gang.
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Subject Author Posted

selecting the response model

Juan January 20, 2015 01:52PM

Re: selecting the response model

gang January 20, 2015 02:55PM

Re: selecting the response model

Juan January 20, 2015 03:29PM