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help > RE: What happens with ART outliers ?
Feb 20, 2020 06:02 PM | Alfonso Nieto-Castanon - Boston University
RE: What happens with ART outliers ?
Hi Till
CONN's default denoising procedure does not interpolate outlier scans, nor does it remove entire subjects, it simply disregards individual scans/timepoints flagged as a potential outliers by virtue of explicitly regressing out any outlier effects as part the denoising procedure. For a general description of the denoising procedure in CONN see https://web.conn-toolbox.org/fmri-method... , and/or the "treatment of temporal confounding factors" section in the original CONN paper (listed in https://web.conn-toolbox.org/resources/documentation ), and for a general description/justification of this "scrubbing" procedure see Power et al. 2014 "Methods to detect, characterize, and remove motion artifact in resting state fMRI" manuscript)
Best
Alfonso
Originally posted by Till Langhammer:
CONN's default denoising procedure does not interpolate outlier scans, nor does it remove entire subjects, it simply disregards individual scans/timepoints flagged as a potential outliers by virtue of explicitly regressing out any outlier effects as part the denoising procedure. For a general description of the denoising procedure in CONN see https://web.conn-toolbox.org/fmri-method... , and/or the "treatment of temporal confounding factors" section in the original CONN paper (listed in https://web.conn-toolbox.org/resources/documentation ), and for a general description/justification of this "scrubbing" procedure see Power et al. 2014 "Methods to detect, characterize, and remove motion artifact in resting state fMRI" manuscript)
Best
Alfonso
Originally posted by Till Langhammer:
Hey everybody.
Sorry for the basic question, somehow i dont't figure out the answer myself.
What does conn do with the identified outliers? In the default pipeline the threshold is 0.9. BUT, is their a threshold for removing the whole subject like when there are more than 50 outliers?? can i change that? i work with the batch and gui...
does conn displace the outliers with a mean of the previous and following timepoint? where can i read more about that??
thanks in advance!!
Till from Berlin
Sorry for the basic question, somehow i dont't figure out the answer myself.
What does conn do with the identified outliers? In the default pipeline the threshold is 0.9. BUT, is their a threshold for removing the whole subject like when there are more than 50 outliers?? can i change that? i work with the batch and gui...
does conn displace the outliers with a mean of the previous and following timepoint? where can i read more about that??
thanks in advance!!
Till from Berlin
Threaded View
| Title | Author | Date |
|---|---|---|
| Till Langhammer | Feb 20, 2020 | |
| Alfonso Nieto-Castanon | Feb 20, 2020 | |
| Stephen L. | Feb 20, 2020 | |