Hi everyone!
I am trying to set up my FEAT to analyze a task based experiment and I have some doubts on the Hemodynamic Response Function.
I decided to do a first-level analysis on each subject and because they did different runs (6), I will first analyze each run and then average them all together.
I did the EVs for the 4 stimuli we are interested in, but I am not sure about the response function: each stimulus is a sentence to read and subjects took a few seconds to read it plus there is the hemodynamic delay to account for. My question is: would it be a solution to consider only the latter 5-6 seconds of each stimulus?
I modeled each EV as a custom 3-column, so I was thinking that I could add some seconds to the first column (time onset) and reduce the duration to account only for the latter 6 seconds. Would it be correct?
Another question I have is: do I need some contrasts in this first level analyses or not? If you need more details on the experiment to answer these questions, I can give them to you, or you could also look at another post I made in September: First Level Analysis FEAT.
Thank you so much,
Carlotta.
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