faulty event duration

[grighi]

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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