Forward model conductivities

[Dr. Carsten Wolters]

Dear Paul,

head tissue conductivities seem to have a larger inter- and
intra-subject variability.
I attachted a 4-page-proceedings paper with regard to those issues that
we recently presented :
@InProceedings{CHW:Wol2010,
  author =       "C. H. Wolters and S.Lew and R. S. MacLeod and M. S.
H{\"a}m{\"a}l{\"a}inen",
  title =        "Combined {EEG/MEG} source analysis using calibrated
finite element head models",
  booktitle =    "Proc. of the 44th Annual Meeting, DGBMT",
  address =      "Rostock-Warnem{\"u}nde, Germany, Oct.5-8, 2010",
  year =         "2010",
  note =         "http://conference.vde.com/bmt-2010",
}

Best regards
   Carsten

Paul Czienskowski wrote:
> Dear all,
>
> Alexandre Gramford pointed out to me that there was some discussion
> ongoing on which conductivities to use for EEG-Forward-Modeling and
> I'd like to move this discussion more to public for it could be
> interesting for many of us.
> I was recently overflying some papers concerned with that very issues
> and I made some interesting and discoveries, especially in
>
>     Conductivity of living intracranial tissues. by Latikka J, Kuurne
>     T, Eskola H.
>     The electrical conductivity of human cerebrospinal fluid at body
>     temperature by Baumann et al.
>
> The first one measured the conductivities (or resistivities) of living
> brain tissue and came to values of 3.51 Ohms*m and 3.91 Ohms*m for
> grey respectively white matter and 0.80 Ohms*m for the CSF (which are
> about 0.28, 0.256 and 1.25 S/m). In contrary the second one found a
> value for 1.79 S/m for CSF at body temperature where it was about 1.4
> S/m at room temperature. The Skull-To-Brain conductivity ratio was
> measured for example in
>
>     Estimation of /in vivo/ brain-to-skull conductivity ratio in
>     humans by Yingchun Zhang, Wim van Drongelen, and Bin He
>
> where they found a ratio of about 1/18.7 which is way larger than the
> commonly assumed value.
>
> I would appreciate very much if many of you could contribute to this
> discussion by telling us which values you use for the conductivities
> and on which publications the are based.
>
> Best,
> Paul
> --
> Paul Czienskowski
> Max Planck institute for human development
> Lentzeallee 94
> 14195 Berlin
>
> Björnsonstr. 25
> 12163 Berlin
>
> Tel.: (+49)(0)30/221609359
> Handy: (+49)(0)1788378772
>
> ---------------------------------------------------------------------------
> You are receiving this message because you are subscribed to
> the FieldTrip list. The aim of this list is to facilitate the discussion
> between users of the FieldTrip toolbox, to share experiences
> and to discuss new ideas for MEG and EEG analysis.
> See also http://listserv.surfnet.nl/archives/fieldtrip.html
> and http://www.ru.nl/neuroimaging/fieldtrip.
> ---------------------------------------------------------------------------
>


--
PD.Dr.rer.nat. Carsten Wolters
Institute for Biomagnetism and Biosignalanalysis
University of Muenster, 48149 Muenster, Germany
Tel.: +49/(0)251-83-56904
Fax:  +49/(0)251-83-56874
http://biomag.uni-muenster.de


---------------------------------------------------------------------------
You are receiving this message because you are subscribed to
the  FieldTrip list. The aim of this list is to facilitate the discussion
between  users of the FieldTrip  toolbox, to share experiences
and to discuss  new ideas for MEG and EEG analysis.
See also http://listserv.surfnet.nl/archives/fieldtrip.html
and http://www.ru.nl/neuroimaging/fieldtrip.
---------------------------------------------------------------------------
-------------- next part --------------
A non-text attachment was scrubbed...
Name: BMT-paper-WoltersEtAl-Final.pdf
Type: image/pdf
Size: 496527 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20101025/79bdf63f/attachment-0002.bin>