faulty event duration

[Aninha Vianna]

Hi Giulia,

Did you figure out why the gazedata file shows time durations for your 
slides that are different than the ones you set up on e-prime? I'm having 
the same problem, for example, I have a slide set up to last for 1000ms and 
gazedata shows that it lasts for about 2200ms...

Thank you!!

On Thursday, June 17, 2010 2:45:39 PM UTC-7, grighi wrote:
>
> Hi David 
>
> unfortunately the PST staff is a bit too overwhelmed and i was hoping 
> to figure out what may be happening more quickly. 
>
> In answer to your question, the slide showing duration issues is the 
> last one in a trial and is followed by a user operated break before 
> the beginning of the next trial. 
>
> The other thing that is very puzzling to me is that if i go and look 
> in the gazedata file which writes out a line of data for each 17ms 
> time point (we are using a 60Hz eyetracker) the program thinks that 
> the duration os this slide is 5 seconds, when in fact we have timed it 
> and it stays on the screen between 8 and 10 seconds. 
>
> thanks again 
> giulia 
>
>
> On Jun 15, 2:58 pm, David McFarlane <mcfar... at msu.edu> wrote: 
> > Giulia, 
> > 
> > Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
> > takes any and all questions athttp://
> support.pstnet.com/e%2Dprime/support/login.asp, and they 
> > strive to respond to all requests in 24-48 hours (although current 
> > estimates are more like 10 days) -- this is pretty much their 
> > substitute for proper documentation, so make full use of it.  3) If 
> > you do get an answer from PST Web Support, please extend the courtesy 
> > of posting their reply back here for the sake of others. 
> > 
> > That said, here is my take... 
> > 
> > Hmm, that is a new one.  Are you sure that you do not have two of 
> > those Slides in a row, or end the trial with that Slide and then 
> > start the next Trial with the same Slide?  That's all I can come up 
> > with based on the description. 
> > 
> > -- David McFarlane, Professional Faultfinder 
> > 
> > At 6/14/2010 05:03 PM Monday, you wrote: 
> > 
> > 
> > 
> > >i am sorry to bug you with what may be a trivial problem, but i am 
> > >really not sure how to fix it. 
> > 
> > >I have an experiment programmed in Eprime and running concurrenlty 
> > >with Tobii Studio, using the tobii studion extensions for Eprime. Note 
> > >that this paradigm is meant to be used with infants 
> > 
> > >The paradigm is composed of two main parts. In the first part the 
> > >subject is shown a series of short videos that serve the function of 
> > >attention getters followed by a slide that contains two faces. Within 
> > >that slide we have defined a gaze contingent zone, in order to have 
> > >the infants look at the faces for 10 seconds. This first part all 
> > >seems to run fine. 
> > 
> > >However some timing problems arise in the second part. In the second 
> > >part the infant is exposed to 8 trials that have the following 
> > >structure: a short video is presented to get their attention, followed 
> > >by a face (a familiarization stimulus) that is set up to be gaze 
> > >contingent so that all the infants will look at it for the same amount 
> > >of time. The face is followed by another short video, which is 
> > >followed by a test trial, which is a slide containing two faces side 
> > >by side. This slide is up for 5 seconds, and is the followed by 
> > >another short video. The problem arise on the final slide in each 
> > >trials which follows this last video and contains two more faces. This 
> > >slide is set up identically to the one occurring above. However, 
> > >instead of remaining on the screen for only 5 seconds, which is the 
> > >time indicated in the settings, it appears to remain on the screen for 
> > >twice that amount. This appears to be true regardless of the provided 
> > >durations, such that 2 seconds turn into 4 and so on. 
> > 
> > >Any suggestions on what may be happening? 
> > 
> > >thank you 
> > 
> > >giulia 
> > 
> > >Children's Hospital Boston 
> > >Laboratories of Cognitive Neuroscience

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