E-Prime and I-View: Gaze contingency

[Sonia Bansal]

 I have managed to script an experiment in E-prime and set the 
communication and eye tracking up, but am having trouble with the gaze 
contingency part of the experiment. 

Basically, I have a fixation window/AOI set up around the central fixation, 
and when subject's eyes leave that window and look towards a peripheral 
target, I want that eye movement to trigger the next slide to be presented. 
(I just want to force fixation at the centre at the beginning of the trial 
for a certain period of time).

What I have tried is set and enabled an AOI to obtain a count of the number 
of gaze data samples  that are within that AOI, and for at least let's say 
500 hits(calculated based on required fixation duration and sampling rate), 
that fixation screen is to stay on before a target (next slide) comes on.

Any help with this would be highly highly appreciated!!

Thanks,
Sonia

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