Thanks,
I am really more interested in finding answers, or understanding, the parametric modulations and how SPM deals with it. Your point is absolutely right and I understand it. However, I have this data right now and I am trying to, as much as I can, accurately model it since it is my first fMRI analysis !
So another more two questions that I have and realized from your answer are :
5) if I model it as a block design I would not get what I want in terms of seeing the effects of the grip since the parameter should have the same length as the condition.
6) What is the best way to model it using the parameter modulation?
And of course plus my previous questions as they are really important for me to understand.
Thanks
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