[Eeglablist] Question about ASR (Artifact Subspace Reconstruction)

[Makoto Miyakoshi]

Dear Hoang,

> I don't really understand the part of the code that performs PCA. Which
variance represent the Principal Components in asr_process.m file?

See asr_process() line 153-155.

  % do a PCA to find potential artifact components
            [V,D] = eig(Xcov(:,:,j));
            [D,order] = sort(reshape(diag(D),1,C)); V = V(:,order);

If you want to change the algorithm, you want to modify this part.

Makoto


On Sun, May 15, 2016 at 9:19 PM, Huy Hoàng Trần <hoangtran355 at gmail.com>
wrote:

> Hello,
> Thanks for your response.
> I can use ASR in my data and it works very well, and now I want to modify
> the code.
> I don't really understand the part of the code that performs PCA. Which
> variance represent the Principal Components in asr_process.m file?
>
>
>
>
> Vào Th 6, 13 thg 5, 2016 vào lúc 01:43 Tarik S Bel-Bahar <
> tarikbelbahar at gmail.com> đã viết:
>
>> Hello, I have a related question, can we set the specific channels used
>> in ASR without hacking into the functions ?
>> Huy, you may benefit from using the new published PREP pipeline from
>> Kothe and colleagues, which I believe also implements ASR and various other
>> functioins for automatic pre-processing.
>> Best wishes!
>>
>> On Thu, May 12, 2016 at 12:27 AM, Huy Hoàng Trần <hoangtran355 at gmail.com>
>> wrote:
>>
>>> Hello
>>> I am working with ASR and I wonder if it would be possible to replace
>>> PCA step in ASR with another algorithm?
>>>
>>> Thank you for any responses!
>>>
>>> Hoang
>>>
>>> Department of Automation Technology,
>>> Institute of Information Tech., Vietnam Academy of Science and Tech.
>>>
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>>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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