[Eeglablist] Wrong channel location with MNI brain model

[李想]

Hi Steve


Thanks for your reply!


Actually, I solved this problem in a sort of awkward way that I did use MNI template to add channel locations for a second time afterwards. It did work for me. :) 


Anyway, I will try your strategy in that it seems cool and solves the problem based on what channel location file is all about.


Sincerely,
Li Xiang




------------------ 原始邮件 ------------------
发件人: "Stephen Politzer-Ahles";<stephen.politzer-ahles at ling-phil.ox.ac.uk>;
发送时间: 2015年11月5日(星期四) 凌晨4:00
收件人: "Li Xiang"<xiang.li.90 at foxmail.com>; 
抄送: "eeglablist"<eeglablist at sccn.ucsd.edu>; 
主题: Re: [Eeglablist] Wrong channel location with MNI brain model



Hi Xiang,


I'm not sure what exactly is causing this issue as I haven't used the MNI template. However, I also use a cap where FCz is the online reference and I need to put it back into the data, and I usually hard-code its location rather than reading it from the template. As you can see from the figure, the location of FCz should be halfway between FC1 and FC2 on the x-axis (this should be 0), and should be halfway in between Fz and Cz on the y-axis (so the mean of the y-values for those two channels). Usually I just use those values to set the location of FCz, and then it comes out in the right location. I don't know if this is sufficient for things like source analysis, but for the analyses I typically do where I do not care about source localization then it has worked fine in the past.


Best,

Steve




---

Stephen Politzer-Ahles
University of Oxford
Language and Brain Lab, Faculty of Linguistics, Phonetics & Philology
http://users.ox.ac.uk/~cpgl0080/




 
On Tue, Nov 3, 2015 at 7:21 AM, 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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