Prerelease and data logging

[Cecilia Westbrook]

Thanks, this is helpful.

One question that I still can't seem to find the answer for, though, is: 
what does E-Prime log as OnsetTime for an object set with pre-release? Does 
it log when the object starts drawing, or when it actually displays?

On Wednesday, June 4, 2014 2:47:11 PM UTC-5, Paul Groot wrote:
>
> 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.we... at gmail.com 
> <javascript:>> 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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