Should the jitter be a multiple of the TR in an event-related fMRI design?

I plan to use a poisson-distributed jitter (mean 4 s) for my experiment and wonder whether the jitter can / should be a multiple of the TR (2 sec), i.e., 2, 4, 6, 8 s or whether it should NOT be...

10 September 2013 294 4 View