PEER Analysis
There are at least two options for analyzing EEG data collected via PEER available:
1. Export the data in Brain Vision Analyzer format and analyze it this way. This is by far the easiest way to analyze data collected with PEER and Brain Products has excellent tutorials, webinars, and workshops on how to analyze EEG data using Brain Vision Analyzer.
2. Export the data in Brain Vision Analyzer format and analyze it using EEGLAB. For example, to load EEG data collected with PEER into MATLAB via EEGLAB:
[EEG, com] = pop_loadbv(pathname, filename);
EEG = pop_chanedit(EEG,'lookup','Standard-10-20-Cap81.ced');
EEG.pathname = pathname;
EEG.filename = filename;
It is a good idea to remove the BIP channel for now, so you could do something like this:
EEG.nbchan = 7;
EEG.chanlocs(8) = [];
EEG.data(8,:) = [];
And in terms of processing, just use EEGLAB from here on out. For example, to filter the data you could use the following command:
EEG = pop_eegfiltnew(EEG, 0.1, 30);
And so on.
3. Coming soon, web-based analysis of Xon data collected from PEER using Jupyter notebooks.
There are at least two options for analyzing EEG data collected via PEER available:
1. Export the data in Brain Vision Analyzer format and analyze it this way. This is by far the easiest way to analyze data collected with PEER and Brain Products has excellent tutorials, webinars, and workshops on how to analyze EEG data using Brain Vision Analyzer.
2. Export the data in Brain Vision Analyzer format and analyze it using EEGLAB. For example, to load EEG data collected with PEER into MATLAB via EEGLAB:
[EEG, com] = pop_loadbv(pathname, filename);
EEG = pop_chanedit(EEG,'lookup','Standard-10-20-Cap81.ced');
EEG.pathname = pathname;
EEG.filename = filename;
It is a good idea to remove the BIP channel for now, so you could do something like this:
EEG.nbchan = 7;
EEG.chanlocs(8) = [];
EEG.data(8,:) = [];
And in terms of processing, just use EEGLAB from here on out. For example, to filter the data you could use the following command:
EEG = pop_eegfiltnew(EEG, 0.1, 30);
And so on.
3. Coming soon, web-based analysis of Xon data collected from PEER using Jupyter notebooks.
PEER Marker Values
The following tables describe the marker values recorded for each of the PEER study types.
Oddball (PEER 3, 4, 4.1)
Marker, Description
1 Start trial - fixation appears (Oddball on left).
2 Start trial - fixation appears (Oddball on right).
5 Control/Normal stimulus appears.
6 Oddball stimulus appears.
7 Tap down - correct response.
8 Tap down - incorrect response.
9 Tap down - premature response.
10 Tap down - duplicate response within trial.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Gambling Task (PEER 4, 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Choices appear.
3 Response down.
4 Response up.
5 Response timeout.
6 fixation two appears (after choices).
100 + nWin + choice number (0 <= n < 100) Win Outcome
200 + nLoss + choice number (0 <= n < 100) Loss Outcome
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
N-Back (PEER 4, 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Correct response.
3 Incorrect response.
4 Response timeout.
5 Duplicate response.
6 Premature response.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Image Presenter (PEER 4.1)
Marker, Description
1 Start trial - fixation appears (Stimulus 2 on left).
2 Start trial - fixation appears (Stimulus 2 on right).
5 Stimulus 1 appears.
6 Stimulus 2 appears.
7 Tap down - correct response.
8 Tap down - incorrect response.
9 Tap down - premature response.
10 Tap down - duplicate response within trial.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Posner (PEER 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Correct response.
3 Incorrect response.
4 Duplicate response.
5 Premature response.
6 Response timeout.
7 Cue none.
8 Cue left Correct.
9 Cue left incorrect.
10 Cue right Correct.
11 Cue right incorrect.
12 Left stimulus.
13 Right stimulus.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
RAW Recording (PEER 3, 4, 4.1)
Marker, Description
1 Button 1 down.
11 Button 1 up.
2 Button 2 down.
12 Button 2 up.
3 Button 3 down.
13 Button 3 up.
4 Button 4 down.
14 Button 4 up.
The following tables describe the marker values recorded for each of the PEER study types.
Oddball (PEER 3, 4, 4.1)
Marker, Description
1 Start trial - fixation appears (Oddball on left).
2 Start trial - fixation appears (Oddball on right).
5 Control/Normal stimulus appears.
6 Oddball stimulus appears.
7 Tap down - correct response.
8 Tap down - incorrect response.
9 Tap down - premature response.
10 Tap down - duplicate response within trial.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Gambling Task (PEER 4, 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Choices appear.
3 Response down.
4 Response up.
5 Response timeout.
6 fixation two appears (after choices).
100 + nWin + choice number (0 <= n < 100) Win Outcome
200 + nLoss + choice number (0 <= n < 100) Loss Outcome
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
N-Back (PEER 4, 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Correct response.
3 Incorrect response.
4 Response timeout.
5 Duplicate response.
6 Premature response.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Image Presenter (PEER 4.1)
Marker, Description
1 Start trial - fixation appears (Stimulus 2 on left).
2 Start trial - fixation appears (Stimulus 2 on right).
5 Stimulus 1 appears.
6 Stimulus 2 appears.
7 Tap down - correct response.
8 Tap down - incorrect response.
9 Tap down - premature response.
10 Tap down - duplicate response within trial.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
Posner (PEER 4.1)
Marker, Description
1 Start trial - fixation appears.
2 Correct response.
3 Incorrect response.
4 Duplicate response.
5 Premature response.
6 Response timeout.
7 Cue none.
8 Cue left Correct.
9 Cue left incorrect.
10 Cue right Correct.
11 Cue right incorrect.
12 Left stimulus.
13 Right stimulus.
20 Block start.
21 Block end.
22 Block restart.
23 Baseline start.
24 Baseline end.
RAW Recording (PEER 3, 4, 4.1)
Marker, Description
1 Button 1 down.
11 Button 1 up.
2 Button 2 down.
12 Button 2 up.
3 Button 3 down.
13 Button 3 up.
4 Button 4 down.
14 Button 4 up.