Thanks Jan. Please further help check the below, I am not sure whether I
exactly understand how adding parametric modulator (pm) change the beta of
given values of the 8 blocks of a task are 10+[1:8]
for the model without pm, the beta of the task would be mean(10+[1:8])
for the model with pm, the beta of the task would be 10, and the beta of the
pm would be like 1(the slope is 1)
Is the above correct?