Display Onset Delay: E-Prime and TobiiStudio

[Gisi (RuG)]

I'm writing concerning a breakdown in communication between E-Prime
and TobiiStudio, for those of you who use Tobii Extensions for E-Prime
with a two computer set-up.  We found that when sending a Trigger
Event (such as one marking the start of a Slide) from E-Prime to
TobiiStudio using the Clearview Package Calls, that TobiiStudio is
unable to account for the Display Onset Time of the pictures and sound
files (usually about 200 - 250 ms).  Of course E-Prime itself accounts
for this Display Onset Time in its own calculation of Reaction Time,
etc. Preloading the files in E-Prime will not fix this sort of problem
because there can always be somewhat of a display onset in E-Prime
that Tobii will never be aware of.  The result are segments in
TobiiStudio with up to 250 seconds of fixation cross, which
TobiiStudio assumes is the actual slide picture itself.  Having
accurately located Trigger Events in TobiiStudio is tremendously
helpful in automatic segmentation, so this "mistake" in Tobii is very
unfortunate.  Do any of you know of a solution to this problem?

Thank you,

Gisi
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