Prerelease and data logging

[Cecilia Westbrook]

Hi all,

I'm sure this is covered in another thread, but I was not able to find it 
with searches. I'm using E-Prime for an fMRI task with critical timing. I'm 
using prerelease for my stimuli, but I'm seeing some weirdness in my data 
logging files. For stims with 200ms prerelease, it seems like it is logging 
them as the onsettime + 200ms. Shouldn't it be -200ms?

I see this in two ways: 1) if I look at the onsettime and the offset time 
and subtract them to get a duration, it is 200ms SHORTER than it should be 
(seems like it should be 200ms LONGER). 2) If I log the offsettime of the 
stim immediately preceeding it, the onsettime is 200ms later (even though 
it should be displaying at the same time as the offset time of the previous 
stim, right? +/- a little bit of delay in offsettime - but not 200ms of 
delay, surely?).

What is going on? Does anybody have any advice? Is the most accurate thing 
to do to just use the offsettime of the preceeding stim?

Thanks,
Ceci

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