EEGLAB Workshop III, Nov. 15-18, 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 1 Artifact processing and ERP analysis Task 1 Reject.

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Presentation transcript:

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 1 Artifact processing and ERP analysis Task 1 Reject bad channels Task 2 Reject continuous data Task 3 Reject data epochs Task 4 Analysis of channel ERPs Exercise...

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 2 The example data: faces vs. objects File../data/faces_3.set Data 33 channel EEG, nose-tip reference, 250 Hz sampling rate, Hz, 16 bit, BrainAmps Task speeded discrimination between objects and faces, 500 ms presentation duration, ISI ms, 362 trials

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 3 Artifact processing and ERP analysis Task 1 Reject bad channels Task 2 Reject continuous data Task 3 Reject data epochs Task 4 Analysis of channel ERPs Exercise...

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 4 Reject bad channels >> EEG = pop_loadset('faces_3.set', '...\data\'); >> [ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG, 0);

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 5 Reject bad channels >> pop_eegplot(EEG, 1, 1, 1);

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 6 Reject bad channels EEG = pop_select(EEG, 'nochannel', [19 24]);

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 7 Reject bad channels

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 8 Artifact processing and ERP analysis Task 1 Reject bad channels Task 2 Reject continuous data Task 3 Reject data epochs Task 4 Analysis of channel ERPs Exercise...

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 9 Reject continuous data Equivalent!!

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 10 Reject continuous data TIP: use ICA for eye blink correction

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 11 Reject continuous data To prepare data for ICA, reject odd artifacts and keep stereotyped artifacts Eye blinkstrange

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 12 Artifact processing and ERP analysis Task 1 Reject bad channels Task 2 Reject continuous data Task 3 Reject data epochs Task 4 Analysis of channel ERPs Exercise...

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 13 Extract Epochs (review)

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 14 Extract Epochs (review) >> EEG = pop_epoch(EEG,{'face' 'object'},[-1 2],... 'newname','faces_3_chans removed epochs',... 'epochinfo','yes'); >> [ALLEEG EEG CURRENTSET] = pop_newset(ALLEEG,EEG,... CURRENTSET,'setname',' 'faces_3_chans removed epochs ');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 15 Reject data epochs

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 16 Reject data epochs visual inspection probability

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 17 Reject data epochs Probability (± 5 stds) Visual inspection

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 18 Reject data epochs

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 19 Reject data epochs

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 20 Reject data epochs >> EEG = pop_jointprob(EEG,1,[1:31],5,5,0,0); >> EEG = pop_rejepoch(EEG,find(EEG.reject.rejglobal),0);

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 21 Artifact processing and ERP analysis Task 1 Reject bad channels Task 2 Reject continuous data Task 3 Reject data epochs Task 4 Analysis of channel ERPs Exercise...

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 22 Analysis of ERPs Create separate data sets for face and object trials >> EEG=pop_selectevent(EEG,'type',{'face'},'deleteevents',... 'off','deleteepochs','on'); >> [ALLEEG EEG CURRENTSET]=pop_newset(ALLEEG,EEG,4,... 'setname','faces only epochs');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 23 Analysis of ERPs Select only 'face' epochs: create a new dataset

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 24 Analysis of ERPs >> [EEG,ALLEEG,CURRENTSET]=pop_newset(ALLEEG,EEG,4,... 'retrieve',3,'study',0); >> EEG=pop_selectevent(EEG,'type',{'object'},'deleteevents',... 'off','deleteepochs','on'); >> [ALLEEG EEG CURRENTSET]=pop_newset(ALLEEG,EEG,5,... 'setname','object only epochs'); Do the same thing for 'object' epochs

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 25 Analysis of ERPs >> pop_timtopo(EEG,[ ],[165],'ERP data and scalp maps');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 26 Analysis of ERPs

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 27 Analysis of ERPs >>pop_topoplot(EEG,1,[0:25:200],'face',[3 3],0,'electrodes','off');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 28 Analysis of ERPs >>pop_headplot(EEG,1,[0:25:200],'ERP scalp maps',[3 3],... 'electrodes', 'off');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 29 Analysis of ERPs >>pop_comperp(ALLEEG,1,[4 5],[],'addavg','off','addstd','off',... 'addall','on','diffavg','off','diffstd','off','lowpass',20,... 'tplotopt',{'ydir',-1}); 4 5

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis Analysis of ERPs ERP difference between 2 conditions

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 31 Analysis of ERPs >> pop_export(EEG,'D:\tmp\faces.dat','erp','on',... 'transpose','on','time','off');

EEGLAB Workshop III, Nov , 2005, Singapore: Julie Onton – Artifact processing and ERP analysis 32 Exercise Load dataset 'faces_3.set' from '…/data/' directory Reject noisy channels (optional: reject continuous data stretches) Epoch dataset on all 'face' and 'object' events Explore 1 or more of the following: Reject noisy epochs by hand or use auto-rejection Compare rejection methods and thresholds Select 'face' and 'object' epochs separately Plot ERPs superimposed ERP envelopes rectangular/scalp array Compare 'face' vs 'object' ERPs Export 'face' ERPs into an ascii file