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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
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Dear Peter,
Thank you for your response. Would you allow me to send you the data and ask for your help on the alignment? I can not seem to get this to work...
Nobuko
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nkemmotsu
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AFNI Message Board
Hi-
This is a new question on what was already a *very* long thread. It deserves to be its own thread, which I have split off here.
I have included the link to the prior thread here, so the reference still exists.
--pt
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Hello-
We are dealing with alignment of an epi of partial coverage and a structura
by
nkemmotsu
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AFNI Message Board
Hi Gang,
Thank you so much for your expertise. We have started evaluating the models with 3dDeconvolve -nodata, and I have a couple of questions.
(1) Changing the ISI seems to improve the model a little bit. I see that the standard deviation values in the output get smaller. I wanted to make sure that was generally the right interpretation- And I was wondering if there are any other statist
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nkemmotsu
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AFNI Message Board
Isaac, thanks for your question and response, I believe in "No such thing as a stupid question," and I will also tell you that I always feel stupid when I post on AFNI message board. - NK
by
nkemmotsu
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AFNI Message Board
Hi Gang,
Yes, we are still in the design stage. When you say "optimize" what do you recommend we do? Do you mean that we run 3dDeconvolve with -nodata options and evaluate?
In the past, with fast event-related designs, I have used optseq2 to decide the stimulus intervals, but with this one (with rating phases in between), I am not sure how I can go about optimizing. Any input you
by
nkemmotsu
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AFNI Message Board
Hi Isaac,
It's a very small amount of taste stimulus, but, in similar experiments in the past, the TR that corresponds to swallowing motion is censored.
Nobuko
by
nkemmotsu
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AFNI Message Board
Hi Gang,
We are using taste stimuli so we do not have a control of stimulus duration as precise as we would with visual or auditory stimuli. The subject is instructed to swallow the stimulus 1 second after the presentation, and eventually there will be a rinsing water at the very end of the rating.
Rating periods do not vary across trials. They are always 10 second each, successive 3 differ
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nkemmotsu
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AFNI Message Board
P.S.
I have been giving more thought to this. Maybe I could simply use BLOCK function and give the timings for (1) stimulus presentation (2) rating 1 (3) rating 2 (4) rating 3, because durations of the phases are consistent across trials. However I have multiple types of stimuli so it will be a lot of regressors. Also, what is confusing me is that we had this paradigm as a simple event-related d
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nkemmotsu
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AFNI Message Board
Dear AFNI experts,
We are considering to do the following experiment and I am stuck trying to figure out how best to analyze the data, as well as what to be careful about when deciding the duration of the phases, etc. I would greatly appreciate any input-
(1) Subject receives a sensory stimulus
(2) Subject then (about 2 seconds after the stimulus presentation) rates three different aspects
by
nkemmotsu
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AFNI Message Board