Hi everyone!
I have a dataset of 47 subjects and each of them was acquired 6 times, so 6 runs were done and during these runs 30 sentences were presented in random order for 10 seconds each, after an interstimulus interval i.e. blank screen, ranging from 2-6 seconds, a question screen was presented for 4 seconds asking subjects to rate the question on a 4-point Likert-type scale. Each sentence was assigned to one of four conditions (A: high, low) x (B: high, low).
I will have more info in the next days, but knowing this, what would you do to build the model?
I would like to do a first-level analysis first, so I will do an analysis for each of the runs of each subjects, then I will do a second-level analysis, taking all the runs of each subject as input, and at the end a third-level analysis copmaring different subjects.
How many regressors should I do? How many contrasts?
Thank you,
Carlotta.
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