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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rick reynolds
May 30, 2012 09:01PM
Hi Andrew,

1. Yes. The dmBLOCK(0) default makes sense, as we generally
expect longer stimulus responses to behave as a convolution
of a short response and a top hat function. That is actually
a somewhat recent change, see the output from:

afni_history -past_months 2 -author rwcox -program 3dDeconvolve


2. That is why dmBLOCK(1) is not the default, because dmBLOCK(0)
make more sense (as stated above). There may be some interest
in (1), but most people should use (0).


3. That seems odd to me. If the regressors are different, the
statistic should be different. Do your stim times vary between
1 and 4 seconds? If so, I would expect at least some difference.
Are they identical, or just not very different?

- rick
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Subject Author Posted

Questions about Duration Modulation and dmBLOCK

Andrew Jahn May 30, 2012 02:46PM

Re: Questions about Duration Modulation and dmBLOCK

rick reynolds May 30, 2012 09:01PM