Triers and synchronization in Windows 7.

[Boris]

Hello

We build our experiment program in Python (Win 7). How can we synchronize and send triggers to EEG data? Where can we find synchronization driver?

Thanks

Boris

[Coen]

Send out synchronization triggers via hardware (parallel port, USB, etc.) to the trigger port on the USB-receiver, see http://www.biosemi.com/faq/trigger_signals.htm .

Best regards, Coen (BioSemi)

[anatdn]

Further on previous question.
Is there a recommended way to access the parallel port using python?
Do you recommend using the pyparallel tool?
Can you refer us to any example?

Many Thanks
Anat

[Coen]

Probably the most simple option is to use the output trigger lines on the USB-receiver, controlled via the USB driver function calls (LaVIEW_DLL.dll, function call USB_WRITE, see http://www.biosemi.com/faq/make_own_acq ... ftware.htm). For an example, see source code of ActiView_Light (http://www.biosemi.com/download/ActiView604-Light.zip).

Timing speed and jitter of triggers via the USB-reciever port is quite good (millisecond range), see viewtopic.php?f=8&t=609 .

Best regards, Coen (BioSemi)

[anatdn]

Hi.
Thanks!
We wish to use two seperate computes. One for the experiment and the other for recording of the eeg data. This way the usb port is connected to the recording computer and we can not use it for sending triggers. In this case do you recommend using the parallel port or do tou have another solution?

[Coen]

I recommended to purchase an extra USB-receiver, and use it to sent triggers from the stimulation PC. Trying to use the parallel port is a dead end in my opinion (no computer with parallel port available anymore, not supported by Windows anymore).

Best regards, Coen (BioSemi)