Binlister

[pb865]

This isn't a bug, but a question about Binlister that I can't find an answer to.

In a set of data I have, the event codes are off by 30ms because of a lag that wasn't accounted for. I need to communicate to EEGlab that epochs should be time-locked to the stimulus code onset + 30ms, rather than the marker position alone. How would I write this in a binlitser file? Is this possible?

Thanks!

[Kwinsler]

It sounds like the best approach would be to just shift the event codes in your data to account for the lag. There is a function to do this in ERPLAB. Using the classic GUI, it can be found under ERPLAB > Preprocess EEG > Shift Event Codes. Using ERPLAB studio there is a panel to do this in the EEG tab. In a script this can be done with the pop_erplabShiftEventCodes function. This would be a way to use that function to shift all event codes to account for a 30ms lag:

EEG = pop_erplabShiftEventCodes( EEG , 'DisplayEEG', 0, 'DisplayFeedback', 'both', 'Eventcodes', 1:255, 'Rounding', 'earlier', 'Timeshift', 30 );

[pb865]

I ended up adjusting the event latency pre-epoching instead (not sure why I didn't think of this first):

% Adjust event latency
    for iEvent=1:length(EEG.event)
     EEG.event(iEvent).latency = EEG.event(iEvent).latency + 30;
     end
    [ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG, CURRENTSET); % Store dataset

I will leave this open in case there is another way to do this via Binlister or other functions that could also be a solution.

[pb865]

It sounds like the best approach would be to just shift the event codes in your data to account for the lag. There is a function to do this in ERPLAB. Using the classic GUI, it can be found under ERPLAB > Preprocess EEG > Shift Event Codes. Using ERPLAB studio there is a panel to do this in the EEG tab. In a script this can be done with the pop_erplabShiftEventCodes function. This would be a way to use that function to shift all event codes to account for a 30ms lag:

EEG = pop_erplabShiftEventCodes( EEG , 'DisplayEEG', 0, 'DisplayFeedback', 'both', 'Eventcodes', 1:255, 'Rounding', 'earlier', 'Timeshift', 30 );

Thanks!