beamformer source localization for EEG

[Vladimir Litvak]

Dear Jess and others,

SPM8 and Fieldtrip share infrastructure for forward modelling and
leadfield computation. Therefore, you can use SPM8 to prepare head
model and sensor definition that you can later use for FT beamforming.
This works for both EEG and MEG. MEEGTools toolbox in SPM8 contains
some functions that you can use as examples for where to find vol and
sens in SPM8 dataset. You'll need to go through SPM8 processing stream
(at least with some sample data). Look at the manual for additional
instructions.

Best,

Vladimir

On Thu, Jul 16, 2009 at 6:57 PM, Jess R. Kerlin<jrkerlin at ucdavis.edu> wrote:
> Hi FTers,
>
> I'm using a 128 electrode Biosemi EEG system, attempting to perform
> beam-former source analysis. I had go all the way back to Matlab 6.5 and SPM
> 2, as well as some trial and error to get through it,  but I finally managed
> to get a nolte BEM  using mostly the same code as in the example script "BEM
> head model for EEG" script". However, prepare_leadfield throws the error
> "unsupported volume conductor model for EEG", which is clearly the case
> looking at the prepare_leadfield code.
>
> A few questions on this topic:
>
> Does fieldtrip actually support beamforming source localization on BEM
> models for EEG? Or, given the coarser spatial resolution of EEG, is it
> better to use a simpler spherical model?  Either way, does anyone have
> successful sample code for beamformer localization EEG data, start to
> finish?
>
> And for the developers:
> I love your work.
> I notice the move from SPM 2 to SPM 8 is in the development cue.  Is there
> any release coming soon which will use SPM 8 to make this process smoother?
>
> Many thanks,
>
> Jess Kerlin
>
> Robert Oostenveld wrote:
>>
>> On 9 Jul 2009, at 4:43, Andrei Medvedev wrote:
>>>
>>> Q1. Is it a correct sequence of steps to do source reconstruction for EEG
>>> data in Fieldtrip or do I need to do something more different?
>>
>> Hi Andrei
>>
>> You'll also have to ensure that the EEG data that you are analyzing is
>> average referenced over all electrodes that you intend to use during source
>> reconstruction. The averager referencing should be done prior to
>> freqanalysis.
>>
>> best regards,
>> Robert
>>
>> ----------------------------------
>> The aim of this list is to facilitate the discussion between users of the
>> FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG
>> and EEG analysis. See also
>> http://listserv.surfnet.nl/archives/fieldtrip.html and
>> http://www.ru.nl/neuroimaging/fieldtrip.
>
> ----------------------------------
> The aim of this list is to facilitate the discussion between users of the
> FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG
> and EEG analysis. See also
> http://listserv.surfnet.nl/archives/fieldtrip.html and
> http://www.ru.nl/neuroimaging/fieldtrip.
>
>

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.