Dear Donald,
Thanks for your clarification. It makes sense. However, I still don't know the duration I should input in the GLM.....
In pain study, hemodynamic responses return to the baseline about several seconds after the cessation of a painful stimulation. Usually, if pain stimulus duration lasts for seconds (e.g. 5-second heat pain), people used to specify 5 seconds as the duration in the GLM, rather than, for example, 10 seconds.
Mark
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