faulty event duration

[David McFarlane]

Giulia,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
takes any and all questions at 
http://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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