[Eeglablist] match electrodes when loading channel location file

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Jun 23 10:31:16 PDT 2014


Dear Jerry,

It should. If not, please let us know.

Makoto

On Fri, Jun 20, 2014 at 10:17 PM, Jerry Zhu <jerryzhu at siu.edu> wrote:

> Hi all,
>
> My head model/channel location files (.sfp files) have the order of
> electrodes like this:
> FidNz     0     9.071585155     -2.359754454
> FidT9     -6.711765     0.040402876     -3.251600355
> FidT10     6.711765     0.040402876     -3.251600355
> E1     5.787677636     5.520863216     -2.577468644
> E2     5.291804727     6.709097557     0.307434896
> E3     3.864122447     7.63424051     3.067770143
> E4     2.868837559     7.145708546     4.989564557
> E5     1.479340453     5.68662139     6.812878187
> ….
> E127     -3.743504949     6.649204911     -6.530243068
> E128     -6.118458137     4.523870113     -4.409174427
> Cz     0     0     8.87405
> The EEG data only have data for E1, E2, …, E128 (i.e. 128 data channels)
> After loading the channel location file, I mark FidNz, FidT9, FidT10, and
> Cz as non-data channel.
> Seems like the pop_chanedit() can match the channel with its location
> correctly regardless there are three fiducial electrodes at the top and Cz
> at the bottom in the channel location file
>
> However, if I mess up the channel location file by changing it to (notice
> E1 has been moved to after E4):
> FidNz     0     9.071585155     -2.359754454
> FidT9     -6.711765     0.040402876     -3.251600355
> FidT10     6.711765     0.040402876     -3.251600355
> E2     5.291804727     6.709097557     0.307434896
> E3     3.864122447     7.63424051     3.067770143
> E4     2.868837559     7.145708546     4.989564557
> E1     5.787677636     5.520863216     -2.577468644
> E5     1.479340453     5.68662139     6.812878187
> ….
> E127     -3.743504949     6.649204911     -6.530243068
> E128     -6.118458137     4.523870113     -4.409174427
> Cz     0     0     8.87405
> EEGLAB would then mark the electrodes in the order of E2, E3, E4, E1,
> E5,…E128 instead of E1, E2, E3, E4, E5,…E128
>
> I just want to make sure pop_chanedit() can indeed match things correctly
> with my normal sfp files (not being messed like in my example). Does anyone
> know anything about the details?
>
> Thank you!
> Jerry
> --
> Jian Zhu, M.A.
> Brain and Cognitive Sciences
> Department of Psychology
> Southern Illinois University Carbondale
> Web: http://zhupsy.com
>
> We have two halves in the brain: left and right. Nothing is right in the
> left. Nothing is left in the right.
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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