[Eeglablist] ICA and eye blink component

[Marco Buiatti]

Dear Booer,

blinks are usually well identified by ICA. You may not easily identify
blinks if:
1) your subject blinks really a few times -> not enough for being captured
by ICA, you may just discard the few epochs containing the blinks;
2) when your subject blinks, s/he moves so much that the relative artifact
spreads over most sensors, and ICA is not able to capture it in a few clear
components  -> Also in this case my advice is to  discard the epochs
containing the blinks;
3) you are computing the ICA on noisy data -> reject segments of your data
containing non-stereotypical artifacts and compute the ICA again.

ADJUST works well only if the ICA is computed on clean enough data.

Refs:
On blinks: Croft, R., & Barry, R. (2000). Removal of ocular artifact from
the EEG: A review. Clinical Neurophysiology, 30, 5–19.

On removing blinks with ICA:  Jung, T.-P., et al. (2000). Removing
electroencephalographic artifacts by blind source separation.
Psychophysiology, 37, 163–178.

On removing blinks with ADJUST: Mognon A, Bruzzone L, Jovicich J, Buiatti
M, ADJUST: An Automatic EEG artifact Detector based on the Joint Use of
Spatial and Temporal features. Psychophysiology 48 (2), 229-240 (2011).

Hope this helps,

Marco




On 5 August 2014 08:53, bjj2909102003 <bjj2909102003 at 163.com> wrote:

> Hello,
> I want to use ICA to reject eye blink. But for some subjects it is easy to
> find eye blink component, for others  it is hard to find blink component
> even I use the plugin-ADJUST. So does ICA extract eye blink component
> without fail??
>
> Thanks so much!
> Booer
> ------------------------------
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-- 
Marco Buiatti, PhD

CEA/DSV/I2BM / NeuroSpin
INSERM U992 - Cognitive Neuroimaging Unit
Bât 145 - Point Courrier 156
Gif sur Yvette F-91191  FRANCE
Ph:  +33(0)169.08.65.21
Fax: +33(0)169.08.79.73
E-mail: marco.buiatti at gmail.com
http://www.unicog.org/pm/pmwiki.php/Main/MarcoBuiatti

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