Hi All
I have an fmri paradigm that is basically a boxcar where the task is holding your breath. I am expecting therefore that the BOLD signal will increase with time over the period of the breath-hold. Would the best way to model this be as a boxcar, i.e. giving onsets and durations and then add a regressor that is 0 at rest and an increasing ramp function while they are holding their breath, or is there a better way?
Thanks.
Claire Doody
Medical
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