[FieldTrip] beamformer on EEG data

[Azeez Adebimpe]

Hi Jia,

Can you ft_volumewrite instead of ft_sourcewrite  after interpolation

Azeez

On Sun, Sep 6, 2015 at 4:10 AM, Wu, Jia <jia.wu at yale.edu> wrote:

> Azeez
> Thanks for getting back to me. I used ft_sourceplot and it always looked
> fine no matter what I put in.  When I used unaligned net position and
> headmodel there is no warning while running scripts regarding it. I'm just
> really concerned that something went wrong and the signal I was mapping was
> from a completely wrong part of the brain.
> -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:* Friday, September 04, 2015 11:36 AM
> *To:* FieldTrip discussion list
> *Subject:* Re: [FieldTrip] beamformer on EEG data
>
> Hi Jia,
>
> There  may be problem in viewing if there is no issues or warning in
> headmodel construction.
> Can you use view in fieldtrip first  with* ft_sourceplot* after  or
> before interpolation to compare  with micron?
>
> Azeez
>
>
>
> On Fri, Sep 4, 2015 at 5:17 PM, Wu, Jia <jia.wu at yale.edu> wrote:
>
>> 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.
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__imgur.com_Kn3sbgm.&d=AwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=9ehCplyXHP0-m9ayYv1FOg&m=vgnpwQD5TlKRzVO4m-lQwR08lEmpPNrKkeKHx27rmhI&s=2DWDnT6nVX0DpGqntWy_5IUNtt5OFEJQZloL_ldDxec&e=>
>>
>> Code is here:
>>
>> https://github.com/sindhri/try_fieldtrip/blob/master/run_data_sample_sent.m
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_sindhri_try-5Ffieldtrip_blob_master_run-5Fdata-5Fsample-5Fsent.m&d=AwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=9ehCplyXHP0-m9ayYv1FOg&m=vgnpwQD5TlKRzVO4m-lQwR08lEmpPNrKkeKHx27rmhI&s=lFRgT-Sr8abQl8cd0_eruwtbpdP_3srp7OiXMUZs1KE&e=>
>>
>> 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> 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 [fieldtrip-bounces at science.ru.nl]
>>> on behalf of Wu, Jia [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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>>>
>>
>>
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>
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