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help > RE: Task conditions to include in gPPI model
Oct 21, 2021 12:10 PM | Alfonso Nieto-Castanon - Boston University
RE: Task conditions to include in gPPI model
Dear Lillian,
Yes, exactly. When first defining your gPPI first-level analysis you will be prompted to select the "task" conditions. Those will be the conditions entered as 'psychological' terms in your gPPI model (defined by a design matrix that includes physiological, psychological, and physiological*psychological interaction terms). Then, when you run your first-level analyses (e.g. clicking on 'Done') you may, optionally, select a subset of those conditions if you prefer not to compute connectivity matrices/maps for some of those effects (but even if you do so, those "missing" terms will still be included in the gPPI model as usual, you simply will not get a map to visualize or further analyze those effects)
Best
Alfonso
Originally posted by omaomae:
Yes, exactly. When first defining your gPPI first-level analysis you will be prompted to select the "task" conditions. Those will be the conditions entered as 'psychological' terms in your gPPI model (defined by a design matrix that includes physiological, psychological, and physiological*psychological interaction terms). Then, when you run your first-level analyses (e.g. clicking on 'Done') you may, optionally, select a subset of those conditions if you prefer not to compute connectivity matrices/maps for some of those effects (but even if you do so, those "missing" terms will still be included in the gPPI model as usual, you simply will not get a map to visualize or further analyze those effects)
Best
Alfonso
Originally posted by omaomae:
Dear Alfonso,
Thank you for the detailed explanation! I believe it would be important to account for differences due to the instruction period, so I will rerun my first levels to include that condition in the model as well.
If I am understanding this correctly, once the condition is included in the model it does not matter if I choose to run the first level analyses with or without it, correct? As in, if I choose to include it in the model but uncheck the box for this condition after clicking "Done" to run the first level analysis, it just means I won't have connectivity matrices corresponding to this condition saved in the results directory?
Best,
Lillian
Thank you for the detailed explanation! I believe it would be important to account for differences due to the instruction period, so I will rerun my first levels to include that condition in the model as well.
If I am understanding this correctly, once the condition is included in the model it does not matter if I choose to run the first level analyses with or without it, correct? As in, if I choose to include it in the model but uncheck the box for this condition after clicking "Done" to run the first level analysis, it just means I won't have connectivity matrices corresponding to this condition saved in the results directory?
Best,
Lillian
Threaded View
| Title | Author | Date |
|---|---|---|
| omaomae | Oct 20, 2021 | |
| Alfonso Nieto-Castanon | Oct 20, 2021 | |
| omaomae | Oct 21, 2021 | |
| Alfonso Nieto-Castanon | Oct 21, 2021 | |