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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
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OK, thanks for your replies above.
Yes, you are correct - the ASL varies between the two scans, but not across conditions. It will be used as a covariate to control for changes in blood flow from the medication from scan 1 to scan 2.
by
Claire Wilcox
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AFNI Message Board
Hello again,
So regarding the first question: the number of trials for one condition is indeed (in fact exactly) three times more than the other condition (9 vs. 27). I've heard FSL can handle this correctly - is there a way for AFNI to handle this?
Regarding the second: you've got it right. I think ASL would be a between subjects variable. Basically, the idea is to correct for ch
by
Claire Wilcox
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AFNI Message Board
Hi Gang,
I’ve been doing some thinking/reading on your reply and have the following follow-up questions:
Since I have different numbers of trials for condition 1 and condition 2, how would I obtain the beta differences? Seems like simple subtraction would be a problem, since they would actually have different variances…when the value was carried forward I wouldn't be able to carry forw
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Claire Wilcox
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AFNI Message Board
I used 12 TENT functions (24 seconds). The stimulus lasts for 8 seconds. I wanted to capture what happens during the stimulus and after that. I can alter that though for sure. I could even consider a convolution (a priori HRF) approach, but I don't really know what the HRF will look like in this case.
In our lab we've done PSC calculations using similar approaches (if for shorter len
by
Claire Wilcox
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AFNI Message Board
3dmema - 9 years ago
Hello,
I have a task for which I'd like to use deconvolution (eg. TENT for example) to extract a series of betas, and use 3dremlfit to get Tmaps. Previously we have been using the betas from these kinds of analyses to derive percent signal change (an average of the betas between two time points minus baseline), and then using percent signal change maps in our level 2 analyses (say a group
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Claire Wilcox
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AFNI Message Board
Seems to work great! Thanks all.
Another warning I get is the following, when I open up afni:
*** LAYOUT not found in layout file /Users/clairewilcox/.afnirc
Pasted below is what's in my .afnirc file (in my home directory).
Thoughts on this one?
Best,
Claire
***ENVIRONMENT
AFNI_NO_OBLIQUE_WARNING = YES
AFNI_LEFT_IS_LEFT = YES
AFNI_ENFORCE_ASPECT = YES
AFNI_ORIE
by
Claire Wilcox
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AFNI Message Board
warning - 10 years ago
dyld: warning, unknown environment variable: DYLD_FALLBACKLIBRARY_PATH
Hi,
Everytime I run anything using AFNI I get the aformentioned warning. Things seem to be working just fine, but I just wanted to make sure that there wasn't something happening (wrongly) that I wasn't aware of.
Thanks much!
Claire
by
Claire Wilcox
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AFNI Message Board