[FieldTrip] l1l2 norm inverse solver in fieldtrip?

[Robin]

Hi Alexander,

Thanks very much for the pointers. I am completely new to the area and
was looking at that paper only because it was linked in the Fieldtrip
tutorial which I thought would be a good place to start!

I will definitely check out all the other useful information you provided.

Thanks again,

Robin

On Fri, Feb 8, 2013 at 1:42 PM, Alexandre Gramfort
<alexandre.gramfort at inria.fr> wrote:
> Hi Robin,
>
> the solver for inverse problem with L1/L2 prior as described in:
>
> A Distributed Spatio-temporal EEG/MEG Inverse Solver
>
> is not really tractable on real data. My recent work [1]
> explains how to solve it more efficiently in a few seconds.
>
> [1] http://www.ncbi.nlm.nih.gov/pubmed/22421459
>
> This is what I implemented in mne-python:
>
> http://martinos.org/mne/auto_examples/inverse/plot_mixed_norm_L21_inverse.html#example-inverse-plot-mixed-norm-l21-inverse-py
>
> I have matlab code too but it's less optimized in terms of speed. If
> you feel like porting
> it into Fieldtrip that would be much appreciated. See this page that
> deserves some updates:
>
> http://embal.gforge.inria.fr/
>
> If you're into these methods I invite you to have a look at the next
> improvement using Time-Frequency transforms:
>
> http://www.ncbi.nlm.nih.gov/pubmed/23291276
>
> with demo code:
>
> http://martinos.org/mne/auto_examples/inverse/plot_time_frequency_mixed_norm_inverse.html#example-inverse-plot-time-frequency-mixed-norm-inverse-py
>
> This contribution explains how to correct for amplitude bias and take
> care of loose orientation constraints when working with cortical
> source spaces.
>
> Best,
> Alex
>
> PS : sorry Robert for advertising mne on the fieldtrip mailing list ...
>
> --
> Alexandre Gramfort, PhD
> Assistant Professor,
> TSI, Telecom ParisTech,  CNRS LTCI
> 37-39 Rue Dareau, 75014 Paris, France
> http://alexandre.gramfort.net
> alexandre.gramfort at telecom-paristech.fr
>
>
>
>
> On Fri, Feb 8, 2013 at 12:52 PM, Robin <robince at gmail.com> wrote:
>> Hello,
>>
>> Having got through the preprocessing I am now investigating source
>> reconstruction.
>>
>> The information on the web site is very useful. This tutorial page:
>> http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate
>>
>> Refers to Ou, W., Hamalainen, M., Golland, P., 2008, A Distributed
>> Spatio-temporal EEG/MEG Inverse Solver
>>
>> which looks interesting but I wondered if this method was actually
>> implemented in fieldtrip (or elsewhere). When I look in
>> minimumnormestimate.m this reference is not listed as one of the
>> methods implemented. Is it available as a different named method?
>>
>> Thanks for any help.
>>
>> Robin
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