TET/E-Prime synchronization problem

[Marisa]

I posted this over at the pstnet forums but thought I'd give it a try over 
here too.

Long story short, I'm running an eye-tracking experiment with E-Prime, and 
I switched over from a two-computer, Tobii Studio/E-Prime setup to a 
one-computer setup without Tobii Studio (but still using TET and Clearview 
packages). Now the data file won't display the correct name of the item 
showing on screen when the data point was recorded. 

In the script, this is done by comparing the RTTime to the slide onset time 
(in my experiment it is further complicated by my adding variables recorded 
in the trial list that mark various points in the sound file on the slide, 
such as verb onset, direct object onset, etc.). On my old setup, everything 
worked fine. Now I am only getting the name of the item associated with the 
last-listed condition in the script. 

It seems as if the RTTime is always much larger than the slide onset time, 
so that the script jumps straight to the last condition. This seems to be 
related to the fact that the TETTime starts running when the TET server is 
turned on (so if I were to leave it on for an hour before the experiment 
starts, my first TETTime data point would be 3600000 ms). If I turn on the 
TET server and then immediately start running the E-Prime experiment, the 
problem in the data file goes away. However, I don't want to rely on this 
method because it is imprecise and means I would have to stop and start the 
server after calibration and at other parts in the experiment when data 
isn't being collected.

I'm not sure why this is happening, or why the RTTime (which comes from 
E-Prime) should be decoupled from the slide onset times (which also come 
from E-Prime). I'd appreciate any insights anyone might have. Thanks!


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