[Eeglablist] fit two dipole does not add the new dipole

[Makoto Miyakoshi]

Hi Sara,

Using fitTwoDipoles is a good idea because (1) ICA does produce bilaterally
symmetrically distributed scalp topographies which is a genuine properties
of the brain/EEG (2) When a single dipole is fit to such a topography, it
produces large residual variance, which increases a chance to be rejected
by the subsequent r.v.-based component rejection (decault 0.15).

Let's do this test. From dipole fitting tool, you can choose 'fit two
dipoles' which fits two dipoles to ALL the ICs, which is usually completely
useless but you can use it for not to test whether you can fit two dipoles
to all the ICs. If this does not work, something is wrong with your default
EEGLAB, not Caterina's plugin I wrapped up. Can you please run the test and
let me know how it works? I could be also possible that you misunderstand
the concept of fitting two dipoles.

Makoto

On Thu, Aug 17, 2023 at 6:57 PM Sara Kamali via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi all!
> I am trying to fit two dipoles to my ICs whenever possible. I run the
> fitTwoDipoles on my data and I can see the select field inside the
> EEG.dipfit.model changes to [1,2], with the added xyz and momentums related
> to the new dipiole for some ICs. I can also see the added IC when I plot
> the scalp map inside the 'Locate dipoles using dipfit-->fine fit'. But I
> cannot see it when I plot the dipoles (Using plot components dipoles or
> autofit). I also do not see an increase in the number of dipoles inside the
> STUDY I have created for the dataset.
> Is this a bug or I should do something to add the new dual dipoles to the
> data?
>
> Thank you,
> Sara
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