[Eeglablist] Subjects head radius in DIPFIT2

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Aug 13 15:05:52 PDT 2015

Dear Mostafa,

When I analyzed data in which channel locations were digitized with Zebris,
I needed to re-scale their coordinates. I guess there is consistency in
units (meter, centimeter, or millimeter etc). If you say your dipoles are
all gone after kicking out outside-brain dipoles, probably your scale is
too large.


On Tue, Aug 11, 2015 at 1:47 AM, Mostafa IR <mostafa.rouzbahani at gmail.com>

> Hi eeglab
>  I have questions about different subject heads radius. I used
> >>pop_chanedit to set subjects head radius on my owns. These radius are
> less than 85.In DIPFIT2 head model and settings, I used BESA head model
> which have 85 spherical head radius. Then I manually co-register the
> channels. After that I used the auto-fit for locating the dipoles. I check
> the option to remove dipoles outside the heads. After fitting, all of my
> dipoles removed because all of them located outside the head. If I fitting
> the dipoles location without remove outside head option, I can have them
> all.
> Are you think this is because of my head radius? If yes Is there any way
> to decrease the head size in DIPFIT2 to my owns?
> Thanks
> Mostafa Rouzbahani
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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