[Eeglablist] ANT import and elc

Fri Mar 4 06:31:08 PST 2011

Dear Beth and Balaji,

Balaji's approach works fine to create a new electrode file that is 
similar to the recording montage that you use in ASA. Thanks for 
suggesting this. I've noticed, however, that the channel location 
importer requires a slightly different .elc file format: removing column 
1 from the positions matrix, this is column contains the channel labels. 
This way your electrode files can be imported without errors.

So use:
NumberPositions=    3
UnitPosition    mm
HSPTransformed    false
Positions
94.9    30.7    14.0
96.4    -31.5    14.1
98.3    -0.2    18.6
Labels
FP1    FPZ    FP2

Instead of:
NumberPositions=    3
UnitPosition    mm
HSPTransformed    false
Positions
FP1:    94.9    30.7    14.0
FP2:    96.4    -31.5    14.1
FPZ:    98.3    -0.2    18.6
Labels
FP1    FPZ    FP2

Possible cause for this error:

the .elc importer (a function called readeetraklocs) is written in 2003 
for the EETrak file format. EETrak was a digitizer software that ANT 
replaced with an improved electrode digitizer called Xensor 
(http://www.ant-neuro.com/products/xensor). The files that were written 
by EETrak didn't contain the channel labels before the 3D position. In 
fact you could write anything in front of the 3D position as long as it 
is separated with a colon (:), ASA will still be able to read that 
electrode file, since it uses the labels that are defined at the end of 
the file.

Something similar was also reported by Sara Graziado in november 2010 
and filed as EEGLAB bug 956.

Arno & Dev, the parsing of the .elc file could be improved in 
readeetraklocs, taking the colon-separation into account. Better would 
be a function readasalocs. For this, you could use the 'delim' key for 
loadtxt with val [9 32 58] which are the ASCII symbols for spaces, tabs 
and colons. I'm currently working on that readasalocs function and hope 
to post it before the end of today or otherwise beginning of next week.

Kind regards,
ruud kalis

Am 03/03/2011 21:05, schrieb Lakshmanan, Balaji:
> Hi Beth,
>
> You can maybe try this.
> Export(Data-->Write-->electrodes) the .elc file from ASA after you adjusted your recording montage and try importing this .elc file in to EEGLAB.
> I have not done this but probably should work.
>
> Balaji
>
> -----Original Message-----
> From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Beth Smith
> Sent: Wednesday, March 02, 2011 2:34 PM
> To: 'eeglablist'
> Subject: Re: [Eeglablist] ANT import and elc
>
> While we are on the topic of ANT caps and channel locations in EEGlab, I want to mention my current situation. The .elc file I have from ANT for the standard 32-channel waveguard cap contains the 3d-locations of the channels with 35 positions and 35 labels. But if I adjust the recording montage in ANT, then I believe the import into EEGLab mislabels my channels. I am collecting in ANT and then using EEGlab import function to import the ANT data from their .cnt and .trg files. Next I import locations from the .elc file. But when I plot data, I believe it assigning channel names based on a standard order of channel numbers in the .elc file that does not match the recording montage I have specified in ANT, leading to mislabeling of channel names in EEGLab. Has anyone else experienced this problem that can confirm this?
>
> Much thanks, Beth
>
> Beth A. Smith, PT, DPT, PhD
> Postdoctoral Fellow
> OHSU Balance Disorders Lab
> ________________________________________
> From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Haass, Michael Joseph [mjhaass at sandia.gov]
> Sent: Monday, February 28, 2011 3:22 PM
> To: 'eeglablist'
> Subject: Re: [Eeglablist] ANT read_eep_cnt 64 bit version
>
> Thanks for sharing this Balaji, I was just now looking for this same thing!
>
> Does anyone have a channel locations file for ANT's waveguard DUKE 128 cap?
>
> Thanks,
> Haass
>
> From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Lakshmanan, Balaji
> Sent: Friday, February 25, 2011 8:55 PM
> To: Arnaud Delorme
> Cc: eeglablist
> Subject: Re: [Eeglablist] ANT read_eep_cnt 64 bit version
>
> Hi Arnau,
>
> They did send me the 64bit compiled version(see attached). It is also available in their website(http://www.ant-neuro.com/download/misc).
> I think this works for 32bit version also.. so you can replace the older version with this.
>
> Thanks!
> Balaji
>
> ________________________________
> From: Arnaud Delorme [arno at ucsd.edu]
> Sent: Friday, February 25, 2011 9:38 PM
> To: Lakshmanan, Balaji
> Cc: eeglablist
> Subject: Re: [Eeglablist] ANT read_eep_cnt 64 bit version
> Dear Balaji,
>
> unfortunately, the plugin was developed by ANT and contains some proprietary code so they would need to recompile their code.
> Please let us know if ANT sends you a function and we will update EEGLAB.
> If you are a 64-bit ANT user, send them an email at support at ant-neuro.com<mailto:support at ant-neuro.com>. Maybe if they receive several emails, they will do something about it.
> Best regards,
>
> A. Delorme
>
> On Feb 24, 2011, at 12:17 PM, Lakshmanan, Balaji wrote:
>
>
> Hi  EEGLAB users/ANT support,
>
> I'm not able to read *.cnt files from ANT system using EEGLAB.
> It was working fine in my 32bit MATLAB but stopped working when I upgraded to 64 bit.
> I'm using the most current version of EEGLAB.( eeglab9_0_4_5s).
>
> I guess this might be due to 32bit compiled version of .mex file? Is it possible to get a 64bit compiled version of the mex file for the function read_eep_cnt.m?
>
> Thanks,
> Balaji
>
>
>
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-- 
Ruud Kalis
Product Manager
ANT (Advanced Neuro Technology)
eemagine GmbH, Berlin, Germany
T: +49 (0)30 2904 8404
F: +49 (0)30 2904 8405
I: www.ant-neuro.com
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