[FieldTrip] Correlated sources: LCMV, MNE, dipole fitting

Maris Skujevskis icelandhouse at gmail.com
Wed Apr 13 19:35:17 CEST 2016


Dear Fieldtrip community,

I am trying to localize neural sources of the primary somatosensory
response using the LCMV beamformer on an ERP dataset. In my experiment the
subjects are stimulated bilaterally - both the left and the right index
finger simultaneously receive an identical tactile half a second stimulus.
The LCMV beamformer fails to detect two distinct early cortical sources
(left and right S1), instead I get a single rather central source (along
the lines of Van Veen et al., 1997, Fig.2(f) ).

My question is:
-is it expected that MNE fares better than LCMV when two sources are
correlated? (i.e. would MNE be more likely to detect both right and left
S1)?
-or would dipole fitting be the preferred method for obtaining an accurate
estimate of left/right S1 location?

Any suggestions will be appreciated!


Thanks!
Maris






On Wed, Apr 13, 2016 at 12:00 PM, <fieldtrip-request at science.ru.nl> wrote:

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>    1. Re: Averaging 4D spatio-temporospectral data (trials x
>       channels x frequencies x time) (Mait? Crespo Garc?a)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 12 Apr 2016 11:43:45 +0000 (UTC)
> From: Mait? Crespo Garc?a <maity_winky at yahoo.es>
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> Subject: Re: [FieldTrip] Averaging 4D spatio-temporospectral data
>         (trials x channels x frequencies x time)
> Message-ID:
>         <24058211.2420001.1460461425906.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Ronny,
> try the ft_freqdescriptives. In this tutorial? (
> http://www.fieldtriptoolbox.org/tutorial/cluster_permutation_freq) it
> says you can do it.
> Best,Maite
>
> cfg = [];
> freqFIC_planar_cmb = ft_freqdescriptives(cfg, freqFIC_planar_cmb);
>
>
>
>     El Martes 12 de abril de 2016 12:12, Ronny Ibrahim <
> ronny.ibrahim at mq.edu.au> escribi?:
>
>
>   <!--#yiv0867918924 P {margin-top:0;margin-bottom:0;}-->Dear Fellow
> fieldtrip users,I was wondering whether there is any function which let's
> me to?average my ?4D (trials?x channels x frequencies x time)
> time-frequency?structure along the trials dimension. I have tried to look
> into ft_freqgrandaverage function but it won't let me do it. I had set?the
> keeptrials configuration to 'yes' with the aim of representing my data in
> the relative percentage change format by using the?ft_freqbaseline to
> represent my data in the 'relchange' (percent change format) in?which I
> would like to average.
> Many thank's in advance for your kind help.
> Kind Regards,
> Ronny??
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