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help > RE: conditions as first level covariates
Feb 10, 2017 02:02 PM | Alfonso Nieto-Castanon - Boston University
RE: conditions as first level covariates
Hi Alain,
When using the 'move selected conditions to 1st-level covariates' option the specified condition blocks/events (a timeseries with 1's for those times within the corresponding condition blocks/events, and 0's otherwise) are convolved with the standard hemodynamic response function (note: this convolution step is skipped when setting the 'acquisition' field in Setup.Basic to 'sparse' instead of the default 'continuous' value) and the resulting timeseries are entered as 1st-level covariates in your CONN project. So yes, that means that both onsets and durations are used when computing the condition effect timeseries.
Hope this helps
Alfonso
Originally posted by Alain Imaging:
When using the 'move selected conditions to 1st-level covariates' option the specified condition blocks/events (a timeseries with 1's for those times within the corresponding condition blocks/events, and 0's otherwise) are convolved with the standard hemodynamic response function (note: this convolution step is skipped when setting the 'acquisition' field in Setup.Basic to 'sparse' instead of the default 'continuous' value) and the resulting timeseries are entered as 1st-level covariates in your CONN project. So yes, that means that both onsets and durations are used when computing the condition effect timeseries.
Hope this helps
Alfonso
Originally posted by Alain Imaging:
Hi Alfonso and everyone.
I have a quick question more out of curiosity than everything else.
I am using the Fair et al. method to get pseudo resting state data.
I have entered the task conditions in the conditions tab with onset and durations, than used the functionality "move selected conditions to 1st level covariates".
If I look now in the first level covariates tab and select one of the condition, I can see that it is a vector of size nscan x 1. Does this mean that only the onsets are transferred ? Is the information about duration used at all ?
Thanks in advance
Alain
I have a quick question more out of curiosity than everything else.
I am using the Fair et al. method to get pseudo resting state data.
I have entered the task conditions in the conditions tab with onset and durations, than used the functionality "move selected conditions to 1st level covariates".
If I look now in the first level covariates tab and select one of the condition, I can see that it is a vector of size nscan x 1. Does this mean that only the onsets are transferred ? Is the information about duration used at all ?
Thanks in advance
Alain
Threaded View
| Title | Author | Date |
|---|---|---|
| Alain Imaging | Jan 18, 2017 | |
| Alfonso Nieto-Castanon | Feb 10, 2017 | |
| Daniel Berge | Jan 12, 2023 | |
| Alain Imaging | Feb 10, 2017 | |
| Alfonso Nieto-Castanon | Feb 10, 2017 | |