[Eeglablist] modifying head model for children in dipfit2

Scott Makeig smakeig at gmail.com
Thu Dec 30 16:11:30 PST 2010


Dorothy -

The concept of using customized child head models is a fine one - I hope
Arno or someone on the list can point you to answers to your difficulties
with the current Dipfit2. Zeynep Akalin Acar 's NFT now includes inverse
dipole modeling, I believe, and is aimed first of all at working with
individual subject MRs, so perhaps NFT may also be of use to you here.

I am now working with Zeynep and with Ying Wu here to plan new, more
sophisticated developmental EEG studies. In particular, with first
collaborators we now plan to begin a project to build software returning a
standard developmental head model for a child of any specified age and
gender and hope to execute a pilot phase of this project this year. For this
and later phases, we will be looking for data and potentially for more
collaborators. If you or anyone on this list has an interest in
contributing, let me know privately.

Scott Makeig
smakeig at ucsd.edu


On Thu, Dec 30, 2010 at 12:01 AM, Dorothy Bishop <
dorothy.bishop at psy.ox.ac.uk> wrote:

>   I am learning to use Dipfit2 with eeglab9_0_4_5s.
>
> All works well if I accept default head model.
>
> I would like, however, to modify the head model for children.
>
>
>
> I followed the instructions for doing this that I found in:
>
> http://sccn.ucsd.edu/pipermail/eeglablist/2007/001690.html
>
>
>
> I kept everything the same as for spherical 4 shell model, except that I
> subsituted a new head model file with altered vol.r values to correspond to
> 8 yr old child. I also, on advice from a colleague, made
>
> vol.c(3)=.0084
>
>
>
> Output coordinates default to MNI when you select custom model file, and I
> kept this.
>
>
>
> I then went to Edit Channel locations to set head radius to be same as last
> vol.r value, i.e. 70.3
>
>
>
> I then ran autofit dipoles , specifying 'fit bilateral dipoles'.
>
> But I end up with single dipoles in the middle of the head.
>
>
>
> I am not sure if the problem is with my model specification, or whether
> there is a bug, and would be grateful for advice.
>
>
>
> thanks
>
>
>
>  Dorothy Bishop, Professor of Developmental Neuropsychology,
> Dept of Experimental Psychology, University of Oxford, OX1 3UD.
> tel +44 (0)1865 271369; fax +44 (0)1865 281255;
> WEB: http://www.psy.ox.ac.uk/oscci/
> Blog: http://deevybee.blogspot.com/
>
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation, University of
California San Diego, La Jolla CA 92093-0559,
http://sccn.ucsd.edu/~scott<http://sccn.ucsd.edu/%7Escott>
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