[Eeglablist] Dividing Scalp regions

[Iman M.Rezazadeh]

Dear Simon:
Suppose that for the Frontal region we want to rearrange all electrodes in a
vector based on the criteria that if they are neighbor to each other. So,
for example electrode x1 is surrounded by x2,x3,x4,x5 in the 3D head
coordinates. But in proposed vector there are some alternatives : v=[ x2 x1
x3 x4 x5] OR v=[x3 x4 x1 x2 x5 ] OR ..... so, my question is which of these
vectors are optimal.
Best,
Iman

-----Original Message-----
From: Simon-Shlomo Poil [mailto:poil.simonshlomo at gmail.com] 
Sent: Tuesday, December 11, 2012 10:34 AM
To: Iman M.Rezazadeh
Cc: eeglablist
Subject: Re: [Eeglablist] Dividing Scalp regions

Dear Iman,

I am not sure if I understand your question correctly.. But if you simply
want to divide you electrodes into Frontal, Central, etc.
regions, then you can use the labels field in the EEG.chanlocs structure.
'Fz' e.g. means Frontal midline electrode etc. You can then search for all
electrodes with a label with the letter 'F' and put them in the "Frontal"
region. (this is the way we divide our region in the NBT toolbox
nbt_get_regions function
(http://nbtoolbox.hg.sourceforge.net/hgweb/nbtoolbox/NBTrelease/file/tip/Bio
markers/Supportfunctions/nbt_get_regions.m)

Best regards
Simon

2012/12/11 Iman M.Rezazadeh <irezazadeh at ucdavis.edu>:
> Hi EEGLabers:
>
> Do you have any opinion how can we divide/define different scalp 
> regions based on the electrodes ?
>
> For example,  if we have 128 electrodes and then I want to re-order 
> the electrodes based on the fact that the  close/neighbor electrodes 
> are place next to each other after reordering ? Veroni map is an 
> option but any other thought?
>
> Best,
>
> Iman
>
>
>
> Iman M.Rezazadeh, PhD
>
> Postdoctoral Research Fellow
>
> Center for Mind and Brain
>
> University of California, Davis
>
> irezazadeh at ucdavis.edu
>
> Cell:310-490-1808
>
> Skype: Imanmr
>
>
>
>
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--
--
Simon-Shlomo Poil

Center of MR-Research
University Children's Hospital Zurich

Mobile number: +41 (0)76 399 5809
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Skype: poil.simonshlomo
Webpage: http://www.poil.dk/s/ and http://www.nbtwiki.net and
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