[Eeglablist] Some basic questions about ICA

Chen Chen ccxx2417 at gmail.com
Thu Feb 6 05:09:04 PST 2014


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.


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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