Hi Agnieszka,
I'm relatively junior here, but I think you are wanting to model blood flow that is predicted
by each button press, so I would include a regressor that is 0 for 'non button press' images,
and '1' for 'button press' images. This is akin to having a unique condition - button pressing
- that you want to model because it will predict blood flow, but do not want to examine. You
would do this at the first level.
Cheers
Chris
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