StimTracker can mark the onset of visual stimuli directly by using small light sensors. It can also directly mark the onset of auditory stimuli.
But there are times when sending event markers from the stimulus presentation computer is still necessary, for example to send different event markers to code an experimental condition. When using SuperLab, you can send event markers by creating an event of type “Digital Output” and selecting StimTracker as the output device. In SuperLab 5 and later, StimTracker is the default output device. The following snapshot is for SuperLab 4.5:
In order to send event markers from a computer running SuperLab to StimTracker:
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You need to install the USB driver. This is the only feature in StimTracker that requires installing the USB driver.
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SuperLab version 4.5 or later is required.
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Use a USB cable to connect the computer to StimTracker’s “Main USB” connector.
As a first step, it is important to verify that SuperLab is able to communicate with your EEG software, e.g. Acknowledge or LabChart. To do so, in the Event Editor’s Stimulus tab:
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Set “Pulse duration” to 500 milliseconds
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Set “Inter-pulse interval” to 200 milliseconds
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Set “Repeat pulse” to 10 times
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Turn on all the checkboxes labeled EC0 through EC7 in SuperLab 5 (EM0 through EM7 in SuperLab 4.5)
Making the changes above allows you to send a train of 10 longer pulses, and on all lines, making it easier to troubleshoot.
Now click on the Test Now button. The blue “Marker” light on StimTracker’s front panel should light up. If it does, then this confirms that the USB driver is installed correctly and that SuperLab is able to communicate with StimTracker. Your EEG software should also be able to “see” event markers coming from StimTracker. If it does not, check the cabling between StimTracker and your EEG hardware.
Last Revision: December 2, 2011
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