[Eeglablist] Inter-Electrode Distance

Tue Dec 18 15:45:37 PST 2012

Simon! 

You are right. But what if we do not have access to the subjects and the
data was recorded before.

Best,

Iman

From: Simon Finnigan [mailto:finnigan.simon at gmail.com] 
Sent: Tuesday, December 18, 2012 3:13 PM
To: Iman M.Rezazadeh
Cc: Tim Mullen; UCSD EEG List
Subject: Re: [Eeglablist] Inter-Electrode Distance

Dear All,

Would it be the craziest idea you've ever heard if I were to suggest you
just get a tape measure, place an electrode cap on a head, and measure the
inter-electrode distances?!

Simon

On Tue, Dec 18, 2012 at 7:25 PM, Iman M.Rezazadeh <irezazadeh at ucdavis.edu>
wrote:

Thanks Tim for your response ! and your two cents: ) 

·        Ok let me be clear. If we have electrode location file and fit
anatomical head model ( not spherical ) the results will different . So, my
question is " Is there ANY ANATOLICAL MODEL based on the electrode
locations/labels that can help us to measure the inter-electrode distance?"
I have done a test over 3 different individual scalp and there is +/- 4 cm
difference between using spherical model and real head on average.

·         

Best,

Iman

From: Tim Mullen [mailto:mullen.tim at gmail.com] 
Sent: Tuesday, December 18, 2012 1:04 AM
To: Iman M.Rezazadeh
Cc: Makoto Miyakoshi; UCSD EEG List
Subject: Re: Inter-Electrode Distance

No worries, Iman -- just my two cents :) The email mailing list format is
also not the easiest format to search and follow up on old posts. But I do
think it helps reduce everyone's inbox clutter (and likely ensures you get a
faster/better response) if new posts make clear how the given problem is not
addressed by previously posted solutions.

In the 2010 thread Arno describes a solution for the electrode distance on
the scalp assuming a spherical head model, and this is implemented in the
function elec_distance.m, which you referred to. Asking "does
elec_distance.m work properly?" is something you can probably quickly answer
yourself :) Do you have reason to think this function is not working
properly? Is this not the solution you were hoping for? The more specific
and clear your question, the more help can be provided by the community.

Tim

On Mon, Dec 17, 2012 at 4:51 PM, Iman M.Rezazadeh <irezazadeh at ucdavis.edu>
wrote:

Tim, I have   searched the forum and if you look at my email you can see
that I mentioned the function name as well. Also what Steve pointed at is
sth different ! 

Anyhow, thanks for the reminder for reading the archives and internet search
J  and I would add reading more carefully the emails J 

Iman

From: Tim Mullen [mailto:mullen.tim at gmail.com] 
Sent: Monday, December 17, 2012 4:18 PM
To: Makoto Miyakoshi
Cc: Iman M.Rezazadeh; UCSD EEG List
Subject: Re: Inter-Electrode Distance

Iman, a general rule of forums and mailing lists (such as EEGLAB) is to
first search the forum/list archives for a solution. In this case, the
question has been addressed at least once before: i.e. search for
'inter-electrode distance' in the subject lines for 2010 --
http://sccn.ucsd.edu/pipermail/eeglablist/2010/subject.html. If you can't
find a solution in the archives (or after a little internet searching), then
by all means post to the list :)

Also, I just saw that Steve noted this topic came up a few days ago on the
list...

Tim

On Mon, Dec 17, 2012 at 3:54 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

Dear Iman,

Why don't you try it first since the function is already there :-)

Makoto

2012/12/17 Iman M.Rezazadeh <irezazadeh at ucdavis.edu>

Hi,

Could you please let me know how can I measure the inter-electrode distance
on the head surface? Does elec_distance.m woeks properly? 

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

-- 
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego

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