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help > RE: conditions: .mat overwritten or averaged?
Sep 2, 2017 04:09 AM | Alfonso Nieto-Castanon - Boston University
RE: conditions: .mat overwritten or averaged?
Hi Charlotte,
That looks perfectly fine. If for that individual subject the 'placebo' condition was associated with two functional runs/sessions, then CONN will use all of the timepoints from both of those two sessions to arrive at the connectivity measures for the 'placebo' condition (just the same as when you have a single 'rest' condition that spans multiple runs/sessions). Regarding 'condition2', that should also work as expected, namely the subject with missing condition2 run will simply be removed automatically by CONN from any second-level analysis that uses 'condition2' connectivity measures.
Hope this helps
Alfonso
Originally posted by charlotte p:
That looks perfectly fine. If for that individual subject the 'placebo' condition was associated with two functional runs/sessions, then CONN will use all of the timepoints from both of those two sessions to arrive at the connectivity measures for the 'placebo' condition (just the same as when you have a single 'rest' condition that spans multiple runs/sessions). Regarding 'condition2', that should also work as expected, namely the subject with missing condition2 run will simply be removed automatically by CONN from any second-level analysis that uses 'condition2' connectivity measures.
Hope this helps
Alfonso
Originally posted by charlotte p:
Hi all,
I'm having a problem with specifying my conditions. I have three conditions (placebo, condition 1, condition 2), and (in most cases) three sessions (A, B, and C) - so far, the matching is easy; I just select the condition and then input the onset and duration for each session (0, infinite and so forth).
However, for a few atypical subjects, I had one condition twice with another one missing, for example:
instead of placebo, condition 1, condition 2, I had something like placebo, placebo, condition 1.
I assigned the sessions accordingly, but when I extracted the ResultsROI_Subject*_Condition*.mat files, I noticed that for these atypical subjects I only had one mat file for placebo (instead of 2 - since there were 2 placebo sessions), one for condition 1, and an empty file (NaN in each field) for condition 2.
My question now is: was the second placebo .mat file simply overwritten by the first one, or did conn compute an average for the two placebo runs?
Any help is greatly appreciated,
Best wishes,
Charlotte
I'm having a problem with specifying my conditions. I have three conditions (placebo, condition 1, condition 2), and (in most cases) three sessions (A, B, and C) - so far, the matching is easy; I just select the condition and then input the onset and duration for each session (0, infinite and so forth).
However, for a few atypical subjects, I had one condition twice with another one missing, for example:
instead of placebo, condition 1, condition 2, I had something like placebo, placebo, condition 1.
I assigned the sessions accordingly, but when I extracted the ResultsROI_Subject*_Condition*.mat files, I noticed that for these atypical subjects I only had one mat file for placebo (instead of 2 - since there were 2 placebo sessions), one for condition 1, and an empty file (NaN in each field) for condition 2.
My question now is: was the second placebo .mat file simply overwritten by the first one, or did conn compute an average for the two placebo runs?
Any help is greatly appreciated,
Best wishes,
Charlotte
Threaded View
| Title | Author | Date |
|---|---|---|
| charlotte p | Aug 29, 2017 | |
| Alfonso Nieto-Castanon | Sep 2, 2017 | |
| charlotte p | Sep 6, 2017 | |