[Eeglablist] Bilateral dipoles

[Makoto Miyakoshi]

Dear Salim and Arno (cc Caterina)

Sorry for the slow response.

> Therefore I used bilateral dipoles to reduce the RV.

Use bilateral dipole only when you see clear bilateral scalp topography!

> 1- In (plot component dipoles) options, it gives me only one coordination
ever if I have two dipoles. How can I know where these two dipoles are?

Really? That sounds weird to me. You should close the fine fit window by
pressing 'ok' and not 'x' to update the data.

>2- Using a PCA clustering approach, I might find one cluster located at
the right hemisphere but it has some dipoles at the left side (bilateral
dipoles), Is this cluster correct?

Yes, that should be correct. To be honest I don't know how STUDY clustering
handles dual dipoles, and I (and Caterina also) have wanted to know about
it. Arno?

Makoto

On Tue, Feb 24, 2015 at 7:08 AM, Salim Al-wasity <salim_alwasity at yahoo.com>
wrote:

> Dears
> After decompose my EEG data to components using ICA and estimate their
> dipoles, some of these dipoles have high residual variance(RV). Therefore I
> used bilateral dipoles to reduce the RV.
> 1- In (plot component dipoles) options, it gives me only one coordination
> ever if I have two dipoles. How can I know where these two dipoles are?
> 2- Using a PCA clustering approach, I might find one cluster located at
> the right hemisphere but it has some dipoles at the left side (bilateral
> dipoles), Is this cluster correct?
>
> Sincerely
> Salim
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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