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Hi, As it says in the FEAT manual: "The first number in each triplet is the onset (in seconds) of the period, the second number is the duration (in seconds) of the period, and the third number is the value of the input during that period." That is, the numbers must be in seconds, not milliseconds, but you can use as many decimal places as you like (e.g. 1.245) although very small time differences don't make a big difference in FMRI due to the haemodynamic response function (HRF). All the best, Mark On 29 Oct 2008, at 07:35, Ram Edur wrote: > Hi to FSL users. > > I'm creating a 3 Column format costum file. > My questions: > 1. on the left column (onset time) can i write ms' (3 digits after > period) > 2. on the middle column (duration time) can i write ms' (3 digits > after period) > 3. What do i do if the stimulus was presented for less the 1 second? > what do i > write in the middle column? > > Thanks > Ram >