faulty event duration

[grighi]

Hi all

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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