Hi Reza, 

Your topographical map shows several types of artifacts. Looks like you didn't clean it up nicely. 

However, back to your question, I believe such adjustment needs to be achieved from the channel location option.

HTH.

Samer

Dear Samer

Thank you very much!

Our data were prepossessed before by  filtering in 4-35Hz, So that's why I think the topography is not reasonable. I just applied CSD toolbox to convert coordinates to EEGLAB format.

Sincerely,

Reza

Hi Reza,

Maybe I'm wrong and I'm assuming the risk that people downvote my comment (some people are merciless downvoting a wrong comment, instead of helping to correct the concepts), but I am not sure that one may work csd coordinates with EEGLAB.

Once I had to face that problem and I edited an ELP file only for the channels I was using, which I attach you. So, there is a step in the analysis with EEGLAB that ask to load a such file. I edited it based on the info of an excel sheet that, unfortunately, I don't remember where I found it, but I attach you it also because probably will be useful for you, and perhaps you can track its origin... 

Best,

AC

Hi there!

Dear Alexander,

Thank you so much for your great help!

The CSD coordinates system is different with BioSemi handicap electrode position coordinates. I applied BioSemi converting based on your files, the topography maps still unreasonable, I couldn't find the similar information about CDS conversion in this link;

https://www.biosemi.com/headcap.htm

The other good answer for this question could be found in this link:

http://psychophysiology.cpmc.columbia.edu/Software/CSDtoolbox/faq.html#DifferentLocations

I still looking for a best solution for this problem.

Sincerely,

Reza