[FieldTrip] help with dipole position and orientation

[Frederic Roux]

Dear Jan-Mathijs,

thank you for your response.

Why would you want to look into the grad structure, or in the layout.pos?

As I wrote in my question:
In a paper by Osipova et al. (2008) I read that the position can 
be chosen based on the sensor array of a CTF system with respect 
to head coordinates. 

I thought that I could get some info out of grad.pos or cfg.layout.pos that
would correspond to the head position with respect to the sensor array.
I just don't know any better where to find / access these data.

I think that the coordinates were chosen based on knowledge with respect to the coordinate system. Indeed, the negative x-axis points to the back, and a y-coordinate of 0 represents the midline. 

Great, but which coordinate system is it?
And where in my data can I find similar information?


Best Fred
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Jan-Mathijs Schoffelen, MD PhD 


Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging, 
Radboud University Nijmegen, The Netherlands 


Max Planck Institute for Psycholinguistics, 
Nijmegen, The Netherlands 


J.Schoffelen at donders.ru.nl 
Telephone: +31-24-3614793 

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