[Eeglablist] The number of removed components

[Bin Wang]

Hi, Makoto,

Thank you very much. You are right. 

I am using a dataset with 64 channels. Normally I can get 64 ICs, so if I removed 20 artefact-ICs, I still have about 40 ICs that are confirmed to be brain activity, which is totally reasonable. As long as I can make sure that these 20 IC are related with artefacts, I can remove them and won’t remove much of my data variance. Am I right?

Bin 


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Bin Wang
Cognitive Neuroscience
Institute of Neuroscience and Medicine (INM-3)
Forschungszentrum Juelich, 
Leo-Brandt-Str. 5 
52425 Juelich
Email: b.wang at fz-juelich.de <https://webmail.fz-juelich.de/owa/redir.aspx?C=hswxAlx8wU6cP189jFS_1w0PFSKb8dAIIkV6dqtR-VUUMNMIisKisV7RZADeuZK3wPR2w27Q5yU.&URL=mailto%3abinwang87828%40gmail.com>
     &  binwang87828 at gmail.com <https://webmail.fz-juelich.de/owa/redir.aspx?C=hswxAlx8wU6cP189jFS_1w0PFSKb8dAIIkV6dqtR-VUUMNMIisKisV7RZADeuZK3wPR2w27Q5yU.&URL=mailto%3abinwang87828%40gmail.com>   <https://webmail.fz-juelich.de/owa/redir.aspx?C=hswxAlx8wU6cP189jFS_1w0PFSKb8dAIIkV6dqtR-VUUMNMIisKisV7RZADeuZK3wPR2w27Q5yU.&URL=mailto%3abinwang87828%40gmail.com>
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> On 04 Nov 2014, at 21:11, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
> 
> Dear Bin,
> 
> We only use up to around 20 ICs that is confirmed to be brain EEGs regardless of the channel number.
> 
> By the way you can't say how many IC removal is appropriate. If you remove IC1-10 then you'll remove more than 50% of your data variance, while if you remove IC90-100 it could be less than 1%.
> 
> Makoto
> 
> On Wed, Oct 29, 2014 at 1:22 PM, Bin Wang <binwang87828 at gmail.com <mailto:binwang87828 at gmail.com>> wrote:
> Hi, everyone,
> 
> One simple question: I am using ICA to remove the artefact right now. How many removed components is reasonable? I am using a completely automatic algorithm (ADJUST) now. It seems work for most of subjects. But, it is wired for one subject, I need remove 20 components of 60. Is it reasonable? 
> 
> Thank you in advance,
> Bin
> 
> 
> 
> 
> 
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> 
> 
> -- 
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego

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