Hello Dr. Finkelmeyer,
Thank you for your responses and clarification. What you described is exactly what I plan to do.
The problem is I don't know how to achieve this after reading the scripts you mentioned.
I guessed there are two columns in the first level specification. One is basis function. However, this column offers 5 options (from canonical HRF to finite impulse response) but leaves no option for me to input a desired stair function. Another one is regressors in each session. Is this where I should specify my own stair function?
I am sorry that I am not very good at programing and hence only had experience with the GUIs provided by SPM. Could you please point me to some directions where I can find the instruction/or manual to implement what I want step by step? I really appreciate your help and patience. Thanks!
Sincerely,
Veda
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