Epoching Clinical Data
If you get the error: “can only open 132 chans” run HeadEdit.exe on .edf file.
1.Copy HeadEdit.exe file into folder with data.
- Run in Command Prompt
- Open edf format in Neuroscan
- Mark triggers:
Operation: Add events
Direction: Greater than
Threshold: 100000 (check baseline and trigger max value)
Refractory Period: 200
Stim Code: 1
Repeat for Channel: DC2 and Stim Code:2, etc.
You will see numbers on marking the trials below the trigger channels
- Save as .cnt format
- Create .ev2 file:
check: Report offset in seconds
select output file name (same as .cnt name)
- Create .eeg file (epoch data):
check: Event file > select ev2 file you just created
check: Event file offsets are in seconds
X Minimum: -500
X Maximum: 1000
select output file name (same as .cnt name, but add _epoch)