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stimulus-onset markers in SMI .idf file

Quick version of my question: Is there a way to merge markers in an SMI logfile into the .idf data file? (I would ask SMI if they hadn't evaporated 2 years ago; I'm hoping someone here might be able to help.)

The longer version:
For my eyetracking/ERP study, I need to synchronize the .idf data file from SMI's iViewX with Brain Products actiCHamp EEG data. I had hoped to do this with a simultaneous TTL trigger to both devices. I can send the trigger to the actiCHamp easy as pie...but I can't find a way to send it to the iViewX (you can't even add a parallel port or digital I/O card to our brilliantly built SMI workstation).

Then I noticed in Edwin's Python book the clever idea of adding a PyGaze_log item as a marker right after each stimulus onset.

But then I looked at ...and saw that this puts a marker in the SMI logfile, not the .idf data file.

Hence my question: Is there a way to merge logfile markers into the .idf data file?

Any ideas (short of manually entering each of the 9600 stimuli based on its timestamp) will be greatly appreciated.

PS If you know a way to get the iViewX workstation to receive the TTL trigger, that would be great too.


  • edited February 26

    Your sync question is tricky, because with SMI I don't think it's possible to sync the clocks. However, you can definitely send timestamped markers to iViewX directly. It's in fact fairly straight-forward by adding a few lines in your script:

    def send_message(self, msg):
        # print command to debug window is optional:
        print("message: ", msg)

    You can then used send_message in your script where you want to send a marker instead of the log function, and it will show up in your IDF file with the SMI timestamp.

    Hope this helps!

    I just sent this as a pull request to @Edwin too, so you might see it in the master branch soon.

    Thanked by 2Russell Edwin
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