1 load raw data

2 channel location

3 re-reference

4 filtering (sometimes the data is very huge and therefore the filtering will be very slow, so we can do the filtering later)

5 Create EEG event list (ERPLAB from now on)

6 Assign bins (how to operate on bins? see here)

7 extract bin-based epoch

8 artifact rejection

-> choose channel around the eye. -> update and then reject

9 compute average erps

10 filter if you don’t do it in step 4

11 bin operations if necessary 

12 Plot ERPs

13 Save figures if you want

Remember, these are basic steps to illustrate how to process the EEG data using EEGLAB and ERPLAB toolbox, you’re suggested not to strictly follow these steps.

Code:

%% merge behavioral data into EEG

% Sometimes, it's hard to lively send behavioral data to EEG system, i.e.

% oral response. Here is a code example to merge behavioral result into EEG

% data.

% Author: Jian Chen

% saturn.jian.chen@gmail.com

% 13/Dec/2016

%+++++++++++++%

%% load EEG data first, finish 'channel location', 're-reference'

% get event data via 'event = EEG.event'

event = EEG.event;

event\_back = event;

%% load behavioral data

fid = fopen('YourResponse\_acc.txt');  % here is a vector with length of 540

acc = textscan(fid,'%d');

fclose(fid);

%% set the latency between target code and inserted code

time = 100;

%% creat response event

for i = 2 : 2 : length(event)

Nevent(i/2).bepoch    = event(i).bepoch;

Nevent(i/2).bini      = event(i).bini;

Nevent(i/2).binlabel  = event(i).binlabel;

Nevent(i/2).codelabel = event(i).codelabel;

Nevent(i/2).duration  = event(i).duration;

Nevent(i/2).enable    = event(i).enable;

Nevent(i/2).flag      = event(i).flag;

Nevent(i/2).item      = event(i).item + 1;

Nevent(i/2).latency   = event(i).latency + time;

Nevent(i/2).type      = acc{1}(i/2);

end

%% add new events to original event list

for i = 1:length(Nevent)

event(2*i+i+1:end+1) = event(2*i+i:end); % move rows down

event(2\*i+i) = Nevent(i); % insert response mark

end

%% save event in case of overwrite

save event\_merge.mat event

%% if the EEG data was currently loaded, simply replace the EEG.event with event, then operate as normal

EEG.event = event;

%replace ERPLAB event if you are using ERPLAB plugin

ERP.EVENTLIST.eventinfo = event;