Dear Donald,
(1) only holds if you remain within conditions though. If mean RT is 300 ms in one condition and 500 ms in another you will obtain different results for the differential contrast depending on whether you go with a fixed duration across conditions (be it 0 or 2 s or 400 ms) or the condition means.
With regard to (4), I could be wrong but I think this was adjusted in one of the SPM12 updates this or last year.
Best regards
Helmut
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