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Hi there,
I would like to know if a condition leads to a delayed HRF peaking.
To device an experiment to answer this, I collected finger tapping pilot data with 80 trials of 3s of tapping, and jittered ITI between 5 to 25 seconds, TR=1.6.
The trials are not TR locked because I thought I’d sample different portions of the HRF during each trial.
I run the mkanalysis-sess with -fir 4.8 25.6 flag and all looks to be fine.
My problem is that the resulting ces.nii.gz has only 16 volumes, which correspond to the TR, I assume (because 25.6/1.6=16). So using this, my time resolution for peak detection would be 1.6, which is not what I would like it to be. This is obviously less than ideal for answering my research question.
How could I get the FIR fit to each timepoint so I could reconstruct the HRF myself? Or would there be some other workaround / analysis? Or do I need to collect the data in some other way, i.e somehow sliding the TR-event locking?
Additional question: what is in cesmag.nii.gz, cesmagpct.nii.gz, iminsig.nii.gz and minsig.nii.gz?
Thanks so much again for the help
Lauri Tuominen