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Thank you very much for your reply, Gang!
I have a followup question: if I understand the AM2 analysis correctly, then the controlling for RT is within each condition but not between conditions. This explains the fact that the controlled-for-RT sub-brick (i.e., [#0]) is so similar to the analysis without modulation.
Given that I am worried about differences BETWEEN conditions, is there a better way to control for RT?

Thanks a lot!
kallai