[Eeglablist] Wrong channel location with MNI brain model

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue Dec 1 11:19:11 PST 2015


Dear Xiang,

Check the channel corregistration with the template head. I think your
channel is 90 degrees rotated to the left, which I've seen back in a few
years ago. Use manual fit to confirm if it's initial corregistration
direction is good.

Makoto

On Thu, Nov 26, 2015 at 6:28 PM, 李想 <lxraplikelx at qq.com> wrote:

> Dear Makoto
>
> Thanks for your reply!
>
> Actually, I had another problem with MNI template, that was, I did not get
> reasonable results of DIPFIT when I used MNI instead of BESA template. The
> dipole plot showed that the position of dipoles were definitely wrong since
> it was like located at the opposite side of fair positions I guess. I tried
> twice to use this way you suggested, but finally gave up with this problem.
> And I had seemingly good results with BESA template. Until now, I still
> have no idea about it. What possible reasons could cause this kind of
> problem? I will turn to documentation of eeglab and fieltrip for more
> details about dipfit as well.
>
> Thank you for your always being warm-hearted to helping us.
>
> Best,
> Li Xiang
>
> ------------------ 原始邮件 ------------------
> *发件人:* "Makoto Miyakoshi";<mmiyakoshi at ucsd.edu>;
> *发送时间:* 2015年11月27日(星期五) 上午8:54
> *收件人:* "李想"<lxraplikelx at qq.com>;
> *抄送:* "EEGLAB List"<eeglablist at sccn.ucsd.edu>;
> *主题:* Re: [Eeglablist] Wrong channel location with MNI brain model
>
> Dear Xiang,
>
> When you put FCz back to the channels, follow these steps: you first enter
> the name FCz, then find channel locaitons, and finally optimize head
> center. This can't go wrong.
>
> Makoto
>
> On Mon, Nov 2, 2015 at 11:21 PM, 李想 <lxraplikelx at qq.com> wrote:
>
>> *Dear list*
>>
>> I found a problem when I loaded channel locations with MNI model, but
>> this problem was absent with the BESA model. The problem is when I use *MNI
>> model* to load channel location and *get FCz back in data* which is the
>> online reference electrode, and I also *optimize center location* as
>> Makoto's pipeline suggests. But the result is that *the position of FCz
>> is totally wrongly located* which you can see in the image.
>>
>> image: https://copy.com/izHOmdMe9x4EUkli
>>
>> does anybody encounter this same problem before? and could you please
>> give me some suggestions?
>>
>> Sincerely!
>>
>> Li Xiang
>>>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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