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help > RE: number of frames replaced by despiking?
May 27, 2016 07:05 PM | Alfonso Nieto-Castanon - Boston University
RE: number of frames replaced by despiking?
Hi Hilary and Jeff,
Another simple way to count the number of outliers identified by ART is, in the Setup.Covariates.First-level tab select the 'scrubbing' covariate, then click on the 'covariate tools. aggregate' button and select the 'sum' measure. This will create a new second-level covariate containing the number of outliers per subject identified by ART (this is often a useful "covariate of no interest" for second-level analyses, when one is trying to find out whether some particular second-level results are influenced by potential differences in the degree of movement or artifacs across subjects). In addition, if you have multiple conditions, this same procedure can be used to generate a measure of the number of outliers per condition (e.g. to rule out potential differences in outliers/movement between conditions)
Hope this helps
Alfonso
Originally posted by Jeff Browndyke:
Another simple way to count the number of outliers identified by ART is, in the Setup.Covariates.First-level tab select the 'scrubbing' covariate, then click on the 'covariate tools. aggregate' button and select the 'sum' measure. This will create a new second-level covariate containing the number of outliers per subject identified by ART (this is often a useful "covariate of no interest" for second-level analyses, when one is trying to find out whether some particular second-level results are influenced by potential differences in the degree of movement or artifacs across subjects). In addition, if you have multiple conditions, this same procedure can be used to generate a measure of the number of outliers per condition (e.g. to rule out potential differences in outliers/movement between conditions)
Hope this helps
Alfonso
Originally posted by Jeff Browndyke:
Hilary,
Frames are not replaced in CONN. CONN only accounts for the spikes and includes them as nuisance in any estimation models. As for how to account for the total number, I'm not certain if there's an output somewhere in the pipeline, but one could simply count the spikes in the GUI Denoise tab window. If you run your pointer across the spike graphic, it will show you "0" values along the time course where spikes were detected based upon your ART threshold.
Warm regards,
Jeff
Frames are not replaced in CONN. CONN only accounts for the spikes and includes them as nuisance in any estimation models. As for how to account for the total number, I'm not certain if there's an output somewhere in the pipeline, but one could simply count the spikes in the GUI Denoise tab window. If you run your pointer across the spike graphic, it will show you "0" values along the time course where spikes were detected based upon your ART threshold.
Warm regards,
Jeff
Threaded View
| Title | Author | Date |
|---|---|---|
| Hilary Marusak | May 27, 2016 | |
| Jonathan O'Rawe | Jun 28, 2016 | |
| Jeff Browndyke | May 27, 2016 | |
| Alfonso Nieto-Castanon | May 27, 2016 | |
| Hilary Marusak | Jun 27, 2016 | |