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Hi Dr. McLaren, Sorry to interrupt, but I would like to know if a shorter TR (1.8s) was used, do I still need to change the microtime onset accordingly? Thanks for your reply! Best wishes, Miki ________________________________________ From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of MCLAREN, Donald [[log in to unmask]] Sent: Thursday, May 09, 2013 12:43 AM To: [log in to unmask] Subject: Re: [SPM] Microtime resolution and onset See inline response. On Tue, May 7, 2013 at 10:50 AM, fMRI <[log in to unmask]> wrote: > Hi, > > I read somewhere that I should change the microtime resolution and onset to the number of slices and the middle slice respectively if I did the slice timing preprocessing option. >>> The microtime onset should be set to match the slice timing reference slice acquisition time. > In SPM, it says change it if I have only long TR. the TR that I have is 3.125 s. >>> This is long. > > The reason why I am asking this question is that I did the analysis with and without these changes (i.e, using and not using the default values). What I get is something different in terms of seeing the effects of the parametric modulation. > > Can you please advice me on this issue and whether I should change them or not? > > Thanks > > AS