Artifact processing and ERP analysis

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

Task 1Reject bad channels

Task 2Reject continuous data

Task 3Reject data epochs

Task 4Analysis of channel ERPs

Exercise...

The example data: faces vs. objects

File../data/faces_3.set

Data33 channel EEG, nose-tip reference, 250 Hz

sampling rate, 0.5-100 Hz, 16 bit, BrainAmpsTask

speeded discrimination between objects and faces, 500 ms presentation duration, ISI 500-1900 ms, 362 trials

Exercise...

Reject bad channels

>> EEG = pop_loadset('faces_3.set', '...\data\');>> [ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG, 0);

Reject bad channels

>> pop_eegplot(EEG, 1, 1, 1);

Reject bad channels

EEG = pop_select(EEG, 'nochannel', [19 24]);

Reject bad channels

Exercise...

Reject continuous data

Equivalent!!

TIP: use ICA for eye blink correction

To prepare data for ICA, reject odd artifacts and keep stereotyped artifacts

Eye blinkstrange

Exercise...

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 ');

Reject data epochs

visual inspection

probability

Reject data epochs

Probability (± 5 stds)

Visual inspection

Reject data epochs

>> EEG = pop_jointprob(EEG,1,[1:31],5,5,0,0);>> EEG = pop_rejepoch(EEG,find(EEG.reject.rejglobal),0);

Exercise...

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');

Analysis of ERPs

Select only 'face' epochs:

create a new dataset

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

Analysis of ERPs

>> pop_timtopo(EEG,[-200 796],[165],'ERP data and scalp maps');

Analysis of ERPs

>>pop_topoplot(EEG,1,[0:25:200],'face',[3 3],0,'electrodes','off');

Analysis of ERPs

>>pop_headplot(EEG,1,[0:25:200],'ERP scalp maps',[3 3],... 'electrodes', 'off');

Analysis of ERPs

>>pop_comperp(ALLEEG,1,[4 5],[],'addavg','off','addstd','off',... 'addall','on','diffavg','off','diffstd','off','lowpass',20,... 'tplotopt',{'ydir',-1});

Analysis of ERPs

difference

between

2 conditions

Analysis of ERPs

>> pop_export(EEG,'D:\tmp\faces.dat','erp','on',... 'transpose','on','time','off');

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

Artifact processing and ERP analysis

Documents

Transcript of Artifact processing and ERP analysis

When person meets number: An ERP study on feature processing · An ERP study on feature processing Adam Zawiszewski, Kepa Erdocia, Mikel Santesteban & Itziar Laka University of the

Yuvasoft Technologies LLP...ERP for Textile Industry ERP for Healthcare ERP for Tours & Travels ... Property Auction Management System Web Based Applications Order Management & Processing

ERP (Enterprise Resource Planning) · Transaction Processing Systems (TPS) ERP Applications & Database Management Systems Office Automation Systems (AOS) ERP dalam Klasifikasi Sistem

The time course of processing handwritten words: An ERP ...

SAP ERP Release - Samehara ERP Solution Map 2011.pdfSAP ERP Analytics SAP Product Available ... SAP Business Workflow (S30) Resource Mgmt. ... Purchase Order Processing (S6)

Cross-linguistic Influence in Bilingual Processing: An ERP ... · Cross-linguistic Influence in Bilingual Processing: An ERP Study Gita Martohardjono, Ian Phillips, Christen N. Madsen

ERP CORRELATES OF CONFLICT PROCESSING IN ADHD 1 …real.mtak.hu/29964/1/MS_animstroop_revised_R3_final_REAL.pdf · 2015-10-28 · ERP CORRELATES OF CONFLICT PROCESSING IN ADHD 1 Children

Www.zetasoftwares.com INVENTORY & ORDER PROCESSING ZETA ERP.

Artifact (artefact) reduction in EEG – and a bit of ERP basics CNC, 19 November 2014 Jakob Heinzle Translational Neuromodeling Unit.

Welcome to brayans Ancient egypt museum Artifact 1.3 Artifact 1.2 Artifact 1.4 Artifact 1.1 brayans office Weapon room sports room Food room.

Morphological processing without semantics: An ERP study ......Morphological processing without semantics: An ERP study with spoken words Elisabeth Beyersmann 1, Deirdre Bolger 2,

An ERP study of the processing of subject and object relative ...

Ch 9 Transaction Processing and ERP Systems

ERP Cloud - AP Payment Processing How-To.docx

Untangling syntactic and sensory processing: An ERP study ... · Untangling syntactic and sensory processing: An ERP study of music perception STEFAN KOELSCH,a,b SEBASTIAN JENTSCHKE,a

ERP, SCM, Compliance | Aptean - Axis ERP for Metals, Wire and … · 2018-08-01 · ERP supports companies at all stages of metals production and processing. Inventory is tracked

ERP differences between processing of physical ...

Pre-Processing of ERP Data - University of Nebraska–Lincolncb3.unl.edu/dbrainlab/wp-content/uploads/sites/2/2013/12/5.-ERP-Pre... · Pre-Processing of ERP Data ... Select Low Pass

An ERP study of vocal emotion processing in asymmetric ... · 1 An ERP study of vocal emotion processing in asymmetric Parkinson’s disease Running title: Vocal emotion in Parkinson’s

The EMG Signal Artifact & Interference Sampling Rate Signal References Signal Processing.1.