artifact rejection and running ica - national chiao...
TRANSCRIPT
![Page 1: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/1.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Artifact rejection and running ICA
Task 1Reject noisy data
Task 2Run ICA
Task 3Plot components
Task 4Remove components (i.e. back-projection)
Exercise...
![Page 2: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/2.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Artifact rejection and running ICA
Task 1Reject noisy data
Task 2Run ICA
Task 3Plot components
Task 4Remove components (i.e. back-projection)
Exercise...
![Page 3: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/3.jpg)
Filter the data (if necessary/desired)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
High-pass
recommended
![Page 4: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/4.jpg)
Auto-detection of noisy channels
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
>> EEG = pop_rejchan(EEG, 'elec',[1:71] , 'threshold',5,...'norm', 'on', 'measure', 'prob');
![Page 5: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/5.jpg)
Auto-detected noisy channel
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
![Page 6: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/6.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject continuous data
Equivalent
![Page 7: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/7.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject continuous data
Click and drag with mouse
over noisy data to reject
![Page 8: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/8.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Rejecting data for ICA
To prepare data for ICA:
KeepReject
... but keep stereotyped artifacts (like eye blinks)
Reject large muscle or otherwise strange events...
![Page 9: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/9.jpg)
OR… Extract short epochs
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Choose all events
![Page 10: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/10.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Auto-reject data epochs
![Page 11: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/11.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject data epochs
visual inspection
probability
![Page 12: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/12.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject data epochs
Number of epochsabove thresholdindicated here
32Start by clickingCalculate:
![Page 13: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/13.jpg)
Reject or retain marked epochs
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
32
![Page 14: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/14.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject marked epochs
>> EEG = pop_jointprob(EEG,1,[1:70],5,5,0,0);>> EEG = pop_rejepoch(EEG,find(EEG.reject.rejglobal),0);
![Page 15: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/15.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reject data epochs (automatic)
>> EEG = pop_autorej(EEG, 'nogui', 'on', 'eegplot', 'on');
High enoughto keep
eye blinks
High standarddeviation,multiplespasses
![Page 16: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/16.jpg)
Reject data epochs (automatic)
Iterative rejectionbased on probability
‘eegplot’, ‘on’ showsrejected epochs
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
![Page 17: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/17.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Artifact rejection and running ICA
Task 1Reject noisy data
Task 2Run ICA
Task 3Plot components
Task 4Remove components (i.e. back-projection)
Exercise...
![Page 18: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/18.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Independent Component Analysis
x = scalp EEG W = unmixing matrix
ICA
W-1 (scalp projections)
W*x = u
u = sources
*x = W-1*u
Cha
nnel
s
Time
u = sources
Com
pone
nts
Time
![Page 19: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/19.jpg)
“Secrets” to a good ICA decomposition
Garbage in… garbage out (it’s not magic)
Remove large, non-stereotyped artifacts
Do you have enough data? (based mostly on time, not frames)
High-pass filter to remove slow drifts (no low-pass filter needed)
Remove bad channels
Data must be in double precision (not single)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
![Page 20: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/20.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
‘extended’,1
Option Default Comments
‘extended’ 0 1 is recommended to find sub-gaussians
‘stop’ 1e-7 final weight change stop
‘lrate’ determined too small too long…from data too large wts blow up
‘maxsteps’ 512 more channels more steps
‘pca’ 0 or Decompose only a EEG.nbchan principal data subspace
‘stop’,1e-7‘lrate’,1e-3‘maxsteps’,750‘pca’,50
Runica options
Other algorithms:binica,amica,sobi,acsobiro
![Page 21: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/21.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Runica progress…
![Page 22: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/22.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
ICA weights in EEG structure
![Page 23: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/23.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Artifact rejection and running ICA
Task 1Reject noisy data
Task 2Run ICA
Task 3Plot components
Task 4Remove components (i.e. back-projection)
Exercise...
![Page 24: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/24.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Plot ICA scalp maps
![Page 25: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/25.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Compare 'good' and 'bad' scalp maps
![Page 26: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/26.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Scroll component activities
Time periods that are not independent across ICs should be removed and ICA run again for better decomposition
![Page 27: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/27.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Plot ICA component properties
Trial 4
Trial 1
Trial 2
Trial 3
ERP Image
![Page 28: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/28.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Reviewing component properties
![Page 29: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/29.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Component scalp maps/properties
![Page 30: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/30.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink component
![Page 31: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/31.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Lateral eye
movement
![Page 32: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/32.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Muscle
![Page 33: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/33.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Bad channels
![Page 34: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/34.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
![Page 35: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/35.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Brain ICs
![Page 36: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/36.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Pulse artifacts
periodic spiking behavior
Often 2 peaks
between 5 and 10 Hz
![Page 37: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/37.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Artifact rejection and running ICA
Task 1Reject noisy data
Task 2Run ICA
Task 3Plot components
Task 4Remove components (i.e. back-projection)
Exercise...
![Page 38: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/38.jpg)
IC rejection/back-projection0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
![Page 39: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/39.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink correction
Identify eye-blink components:
![Page 40: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/40.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink correction
![Page 41: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/41.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink correction
![Page 42: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/42.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink correction
![Page 43: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/43.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Eye blink correction
![Page 44: Artifact rejection and running ICA - National Chiao …esciedu.nctu.edu.tw/.../ch/doc/2_ArtRej_RunningICA.pdfEEGLAB Workshop XI, Sept 8 -10, 2010, NCTU, Taiwan: Julie Onton – Artifact](https://reader031.vdocuments.us/reader031/viewer/2022021512/5aedd46b7f8b9a585f90cc63/html5/thumbnails/44.jpg)
EEGLAB Workshop XI, Sept 8-10, 2010, NCTU, Taiwan: Julie Onton – Artifact rejection and running ICA
Exercise
• ALL- Load stern.set
- Epoch the data on memorize and ignore letters
- Scroll the data and perform visual rejection
- Try auto-rejection function and compare to visual inspection
- Find and identify “artifact” ICs
- How can you be sure that an IC is artifact?
- Practive removing a component from the EEG data (do not save this way!). Alternatively, try KEEPING just one component. What does the EEG data scroll look like?