Prerelease and data logging

[Paul Groot]

Hi Cecilia,

You may find one of David's post very informative:

https://groups.google.com/d/msg/e-prime/OeiZ00V9SRc/Vt2QAt3uoOcJ


Also note that the prerelease time of an object is used to prepare the
*following
*object. (This is something that is often overlooked.)

Paul


On 4 June 2014 20:49, Cecilia Westbrook <ceci.westbrook at gmail.com> wrote:

> 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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