triggers

This live demonstration guides you through the process of segmenting event-related potentials (ERPs) in BrainVision Analyzer. The events of interest are represented by several markers, requiring some thought to time-lock each segmentation to the event onset.

This tutorial walks through the key steps: creating grand averages across participants, computing difference waves between experimental conditions, selecting appropriate map types, and defining time windows for visualisation.

I'm sending the triggers in a binary format because Python requires this. For instance, to send the trigger 1, I run the code serialport.write(b'1'). I have succeeded in sending triggers in this way. However, I encounter two problems. First, the triggers are converted in a way I cannot entirely decipher. For instance, when I run the code serialport.write(b'1'), the trigger displayed in BrainVision Recorder is S 49, not S 1 as I would hope (please see Appendix below). Second, I cannot send two triggers with the same code one after the other. For instance, if I run serialport.write(b'1'), a trigger appears in BrainVision Recorder, but if I run the same afterwards (no matter how many times), no trigger appears. I tried to solve these problems by opening the parallel port in addition to the serial port, but the problems persist.