Synchronising an EPrime task with an external device (e.g. NIRS)

[tudor]

Hello everyone,

I'm running an experiment in which near-infrared spectroscopy (NIRS) data 
is recorded from subjects while they are doing a task programmed in Eprime. 
The task is a block design, and the points in time where each block starts 
and ends have to be included in the NIRS recording for data analysis 
purposes. Right now I do this manually, by inserting events into the 
recording every time I can see (by looking over the subject's shoulder!)  
that a block has started/ended, but this is both inconvenient and 
inaccurate, as it sometimes happens to insert an event too late, or even 
miss it.

I was therefore wondering if anyone has ever used Eprime to send sync 
signals from the task into an an external device (connected to the 
experiment computer through a serial/USB/BNC cable), at to program these 
signals to be triggered by certain events in the task, such as the 
beginning/ending of a block. I know people have done that with MRI, however 
in this case it should probably be a lot simpler. The NIRS machine that I 
have (an OxyMon III) has several analog ports but the PC only has USB ports.

I'd very much appreciate any help, many thanks in advance!

Tudor

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