[FieldTrip] beamformer on EEG data

[Wu, Jia]

Azeez,

Thanks for getting back to me. Yes I used the same MRI. But since you asked, I went back and double checked all the steps and put together the code as below. I used MRIcro to looked at the source output. The output still doesn't look quite like a brain: http://imgur.com/Kn3sbgm.

Code is here:
https://github.com/sindhri/try_fieldtrip/blob/master/run_data_sample_sent.m

sample data here: (sorry the link expires in a week)
download password:code
https://files.yale.edu/public_download?shareId=40d6f4c574599585eecaef773c7b927e

Thank you very much for your help!

best,
-jia
________________________________
From: fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl] on behalf of Azeez Adebimpe [azeez.adebimpe5 at gmail.com]
Sent: Tuesday, September 01, 2015 5:28 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] beamformer on EEG data

Hi Jia,

Do you interpolate on the same MRI you used for  construct headmodel?
Can you post your matlab code?

Azeez

On Tue, Sep 1, 2015 at 11:20 PM, Wu, Jia <jia.wu at yale.edu<mailto:jia.wu at yale.edu>> wrote:
Hi,

Here is the most problematic part of my analysis.

When I did not align electrode positions with headmodel, I was able to get interpolated source signal that resembled a brain.
http://imgur.com/bZkGqsk<https://urldefense.proofpoint.com/v2/url?u=http-3A__imgur.com_bZkGqsk&d=AwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=9ehCplyXHP0-m9ayYv1FOg&m=8aDZNzQKqFKPrBsVo7s9Bcw2_W3DVOh8Z_01ATDCjso&s=Pq7HZiQsFtOT9Nl4SPperxlyaBByDsKFHyM5S32q0DE&e=>

However if I managed to align electrode positions with headmodel, (then build the correct leadfield), the interpolated source did not resemble a brain.
http://imgur.com/XQMyiQy<https://urldefense.proofpoint.com/v2/url?u=http-3A__imgur.com_XQMyiQy&d=AwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=9ehCplyXHP0-m9ayYv1FOg&m=8aDZNzQKqFKPrBsVo7s9Bcw2_W3DVOh8Z_01ATDCjso&s=2nXDThp6Y65bF1-enB75g9fYxxFO6z3poQIyctjGq-Y&e=>

Anybody has a clue what was going on?

best,
-jia
________________________________
From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> [fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl>] on behalf of Wu, Jia [jia.wu at yale.edu<mailto:jia.wu at yale.edu>]
Sent: Monday, August 31, 2015 4:33 PM
To: FieldTrip discussion list
Subject: [FieldTrip] beamformer on EEG data

Hi,
I'm new to the community and fieldtrip. I'm trying to use beamformer to do oscillatory source localization on some EEG data.

I thought I stumbled upon some tutorial specific on this top on the fieldtrip wiki, but I couldn't find it any more. Most source localization materials seem to be for MEG data. And I've been confused about the steps to build a correct headmodel, sourcemodel, leadfield based on only EEG information.

Anybody has a quick link to the tutorial? If such tutorial doesn't exist I will email the group about my specific questions.

best,
-jia

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