[Eeglablist] Channel Locations and DIPFIT

[Makoto Miyakoshi]

Dear Hamed,

> So, what should I do exactly now? Must I change the head radius from
*106.906* to *85* again on the channel location window?

No, I think it is just fine.
MNI head model is not a perfect sphere, so the concept 'radius' does not
exactly hold.

Makoto

On Mon, Jul 9, 2018 at 11:10 AM Hamed Taheri <hamedtaheri at yahoo.com> wrote:

> Hello all,
>
> I have a question regarding channel locations, head radius, and DIPFIT.
> Based on Mokoto's preprocessing because my channel montage follows
> International 10-20 system I select 'use MNI coordinate file for BEM
> dipfit model' and then 'Opt. head center'. After doing these two steps
> the head radius (Spherical Radius) changed from *89.2046* before 'Opt.
> head center' to *106.906 *after 'Opt. head center'*. *
> Then I go to DIPFIT head model and setting part, I toggle on the No
> Co-Reg. But my problem is about a note is written at the end of this
> window:  'For EEG, check that the channel locations are on the surface of
> the head model ( To do this: Set head radius to about 85 in the channel
> editor).
> So, what should I do exactly now? Must I change the head radius from
> *106.906* to *85* again on the channel location window?
> I would be so thankful if you could help me with this issue.
>
> Hamed
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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