Referenced Signals can be calculated in NeuroScore when two channels(recordings) need to be subtracted from each other (for corrections, artifact removals, reference subtraction, etc.).
For long recordings that include data gaps, the best is to export first the recordings to EDF format and then open the EDF file in NeuroScore. This is because the Referenced Signals cannot be directly calculated over data gaps (at least not in NS version 3.3.1 and lower).
Step 1: EDF export
- Open Ponemah data in NeuroScore.
- Click on File->Export Recording and select EDF File Export.
- Click on Browse and input the name of the Output file , then click Next.
- Select the signals that you want to reference (subtract from each other), then click Next.
- In the next window, one can select or modify the subject information and then click Next.
- In the following window, one can select the export just for the active period or for the entire recording. Choose Export Whole Recording unless you need to work on separated periods that were previously defined, and then click Finish.
Step 2. Open the exported EDF recordings and add Referenced Signals
- From File->Open Recording, open the EDF file that contains the exported recordings.
- Click on Signals & Data from the menu bar on the right side of the in NeuroScore window and select New Referenced Signal.
- In the next window, keep Reference Signal selected and input the Source Signal and the Reference Signal ; then click Next.
- Give a name to the new referenced signal and then click Finish.
- The newly calculated referenced signal will be displayed in “All Signals” window.