[Eeglablist] Dividing Scalp regions

[Simon-Shlomo Poil]

Dear Iman,

You have the coordinates for the channel locations in EEG.chanlocs, so
you can calculate the distance between the different electrodes. You
could then re-arrange your electrodes depending on this distance. Is
that want you want?

2012/12/11 Iman M.Rezazadeh <irezazadeh at ucdavis.edu>:
> 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
> Office number: +41 (0)44 266 3129
> Skype: poil.simonshlomo
> Webpage: http://www.poil.dk/s/ and http://www.nbtwiki.net and
> http://www.kispi.uzh.ch/Kinderspital/Medizin/mrzentrum_en.html
>
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-- 
--
Simon-Shlomo Poil

Center of MR-Research
University Children’s Hospital Zurich

Mobile number: +41 (0)76 399 5809
Office number: +41 (0)44 266 3129
Skype: poil.simonshlomo
Webpage: http://www.poil.dk/s/ and http://www.nbtwiki.net and
http://www.kispi.uzh.ch/Kinderspital/Medizin/mrzentrum_en.html