[Eeglablist] Some basic questions about ICA

[Makoto Miyakoshi]

Dear Chen,

> I generated four orignal signals and mixed them with a random matrix and

Signals should be linearly mixed.

Makoto

2014-02-06 5:09 GMT-08:00 Chen Chen <ccxx2417 at gmail.com>:

> Hi.
>
> I also have some questions about ICA, I wanna someone can help.
>
> I generated four orignal signals and mixed them with a random matrix and
> add some noise, then I used ICA to remove artifacts/noise and restore
> orignial signals, then I found, after using ICA, the amplitude of orignial
> signals reduced and the order of the orignial signals are changed.
>
> How can I to sovle those two problems?
>
> Thank you for your kindly responses.
>
> CHEN
>
>
>
> On Wed, Jan 29, 2014 at 10:10 AM, Kristoffer Aberg <kc.aberg at gmail.com>wrote:
>
>>  Hi,
>> thanks for a wonderful toolbox!
>>
>> I will try to use ICA to remove blinks / eye-movement / ECG artifacts,
>> but i have some questions i would be very happy if someone could address:
>>
>> 1. For the ICA decomposition, does it matter if the electrode locations
>> are correct? That is, would the decomposition work even if the locations
>> would be completely randomized? I ask because i dont know where to place
>> the eye / ecg electrodes exactly.
>>
>> 2. Is it a good idea to always include the eye / ecg channels in the ICA
>> decomposition? I ask because i thought to decompose data based on scalp
>> electrodes only and then verify blink / pulse components by comparing them
>> to the eye / ecg channels. When should i not include the eye / ecg channels
>> in the ICA decomposition?
>>
>> Thanks for your time and your responses!
>>
>> Kris
>>
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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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