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

[Makoto Miyakoshi]

Dear Sara,

> Especially when I tick the 'fit bilateral dipoles' inside the ('locate
dipoles using dipfit -->autofit) I get an error message.

This report indicates the problem is not related to Caterina's plugin.

> When I try other ICs, sometimes I get that error and some other times I
do not, and a new dipole is added.

Judging from this report, I guess the problem is in your dataset.

If you want to troubleshoot it with me, please let me know. We can have a
quick Zoom session to share your screen with me on which I can most likely
find the issue.

Makoto


On Fri, Aug 18, 2023 at 2:23 AM Sara Kamali <sara.kamali at uam.es> wrote:

> Hi Makoto,
>
> Thank you for the reply.
> I did exactly as you said. First, I ran the fit two dipole, then (since it
> does not add the dipoles), I follow the steps in '
> https://urldefense.com/v3/__https://eeglab.org/tutorials/09_source/DIPFIT.html*automated-dipole-fitting__;Iw!!Mih3wA!E7uklFuu9mDRe0fu9NGQ3v9Uo3_PPjKsmIkEIOHYIKq1RTI1Jnpu8snTb2fUafQv4TrMYf53ot2lyR0aYDx7psFc2dc$ 
> <https://urldefense.com/v3/__https://eeglab.org/tutorials/09_source/DIPFIT.html*automated-dipole-fitting__;Iw!!Mih3wA!H4Xkw7_QtGWBBkGHzlOjHtilOCahi7_JPTOsxFQhnp26A4vT7eyP9-401prv9CaPvfP1YD_gTWDaWMzuDq_TwTs$>'
> to add the dual dipole to the ICs selected by the 'fit two dipoles'. But it
> does not work.
> Especially when I tick the 'fit bilateral dipoles' inside the ('locate
> dipoles using dipfit -->autofit) I get an error message. It says there is a
> error in pop_multifit at line 177 where right side is 2 in 3 and left side
> is 1 in 3. This is referring to the xyz position, which fits two dipoles
> added an extra line of the new dual dipole to.
> When I try other ICs, sometimes I get that error and some other times I do
> not, and a new dipole is added. On the ICs selected by 'fit two dipoles' I
> always get this error message. Is this a bug?
> I expect to see there are more dipoles in my study set and I expect to see
> the new dipoles when I try to plot them. Right?
> I am using Matlab R2022b and EEGLAB v2021.0.
>
> Thank you
> ------------------------------
> *From:* eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of Makoto
> Miyakoshi via eeglablist <eeglablist at sccn.ucsd.edu>
> *Sent:* Friday, August 18, 2023 4:14 AM
> *To:* EEGLAB List <eeglablist at sccn.ucsd.edu>
> *Subject:* Re: [Eeglablist] fit two dipole does not add the new dipole
>
> 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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