[FieldTrip] fieldtrip Digest, Vol 167, Issue 2

[Edoardo Pinzuti]

Dear  Jan-Mathijs,

it works only if fixedori is 'yes'  since filt = pinv(sqrt(lf' *
invCy_squared * lf)) * lf' *invCy;  lf  can have only one orientation with
this implementation.

thanks fo the hint
Edoardo

Il giorno gio 3 ott 2024 alle ore 12:10 <fieldtrip-request at science.ru.nl>
ha scritto:

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>    1. Re: lcmv weightnorm (Schoffelen, J.M. (Jan Mathijs))
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 2 Oct 2024 12:07:39 +0000
> From: "Schoffelen, J.M. (Jan Mathijs)"
>         <janmathijs.schoffelen at donders.ru.nl>
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> Subject: Re: [FieldTrip] lcmv weightnorm
> Message-ID: <F6D2DFE0-0210-4BA2-BC1E-95BBDBC3029A at donders.ru.nl>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Edoardo,
>
> The first thing I would check would be the sanity of the sensor level
> data. Are the sensor level data (i.e. the time series on which you computed
> the sensor covariance, and te resulting sensor covariance) real-valued? If
> this is not the case, then somehow the spatial filters that you compute
> automagically become complex-valued. If it’s not due to the sensor level
> data being ill-behaved in terms of complex-valuedness, my next diagnostic
> step would be to put some breakpoints in the matlab code (ft_inverse_lcmv),
> and investigate step by step what is happening.
>
> Good luck,
> Jan-Mathijs
>
> > On 27 Sep 2024, at 18:50, Edoardo Pinzuti via fieldtrip <
> fieldtrip at science.ru.nl> wrote:
> >
> > Dear Fieldtrip users,
> >
> > Do you know why if I use this setting cfg.lcmv.weightnorm = 'nai' for my
> lcmv beamformer analysis I get complex value avg.mom.
> >
> > I am doing a lcmv on resting state data and I need the timecourses of
> specific ROIs is this "nai" parameter required ?
> >
> > Thanks
> > Edoardo
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