[Eeglablist] Biosemi 32 channel .loc file request

Tarik S Bel-Bahar tarikbelbahar at gmail.com
Tue Oct 3 16:39:24 PDT 2017


Another thing you can try is to search on google scholar for
researchers/articles
where the same eeg cap was used and they also used eeglab (though this last
part is not necessary).
Then email those 5 or 10 researchers directly and ask for a
correct/full/working chan locations file.

As noted, try not to save them as a .ced file, but try again saving them
with another file ending, or just .txt, and let eeglab decide when it
attempts to load channel locations in Edit > Channel locations.


On Tue, Oct 3, 2017 at 4:19 PM, mahsa shalchy <mahsa.shalchy at gmail.com>
wrote:

> Dear Tarik and experts,
>
> The thing is my locations seem to work fine just before saving them as
> *.ced file. Also, as I try to save them as other types (loc,...) I'm
> getting the following error:
>
> Cell contents reference from a non-cell array object.
> Error in inputgui>outstruct (line 257)
>     else                  currentobj = allobj{index};
> Error in inputgui (line 198)
>     instruct = outstruct(allobj); % Getting default values
>     in the GUI.
> Error in pop_writelocs (line 148)
>    res = inputgui(geometry, listui,
>    'pophelp(''writelocs'');', ...
> Error in pop_chanedit (line 696)
>                 com = pop_writelocs(chans);
> Error using waitfor
> Error while evaluating UIControl Callback
>
>
> I would be grateful if someone could help me with this problem.
>
> Many thanks,
> Mahsa
>
>
>
> On Tue, Oct 3, 2017 at 1:54 PM, Tarik S Bel-Bahar <tarikbelbahar at gmail.com
> > wrote:
>
>> Hello Mahsa,
>> Nice try, looks like you're almost there.
>> In the future send questions to eegablist list and if you wish CC me.
>> Beware of doing things from command line only.
>> However, you should be able to
>> 1. Use the code line and file you have developed
>> 2. Then save the file (via command line or gui)
>> 3. Then close eeglab, then restart eeglab, then reopen the file form the
>> GUI.
>> 4. Then see if the locations still seem good by jsut plotting the channel
>> locations (rather than editing the channel locations).
>> 5. If the saved file is okay, then you might be good to go.
>>
>> *the issue your're having is about how the coordinates numbers are coded.
>> You would want to make sure that they are in the proper coordinate system.
>> Note that in the Edit Channel locations gui, there are multiple buttons to
>> "transform the coordinates" that you should play with to get a more stable
>> solution.
>>
>> *you also want to plot in 3D from the Edit channel locations to see that
>> the locations are good.
>>
>> *overall you should not be having this problem, and should have a perfect
>> file.
>>
>> *you may want to try to change the filename from *.CED to sfp, and/or let
>> eeglab decide.
>>
>> *try to get things working correctly from GUI first before relying on
>> command line only (though sometimes command line options will save the day).
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Tue, Oct 3, 2017 at 2:17 AM, mahsa shalchy <mahsa.shalchy at gmail.com>
>> wrote:
>>
>>> Dear T,
>>>
>>> I extracted a text file using Biosemi excel coordination (please find
>>> attached) and then used it with the following command:
>>> >> pop_chanedit(readlocs('biosemi_eloc.txt', 'format', { 'labels'
>>> 'sph_theta_besa' 'sph_phi_besa' }, 'skiplines', 1))
>>>
>>> At this point every thing looks fine (please find attached a 2D plot of
>>> the locations).
>>>
>>> Then, I saved the location as *.ced file (please also find attached).
>>>
>>> However, as I go to edit>channel location and upload the *.ced file that
>>> I just created, all the electrodes weirdly fall into a spot near right eye
>>> (please see the last attachment). Would you please help me with this.
>>>
>>> I highly appreciate your help.
>>>
>>> Many thanks,
>>> Mahsa
>>>
>>> On Sat, Sep 23, 2017 at 3:40 PM, Tarik S Bel-Bahar <
>>> tarikbelbahar at gmail.com> wrote:
>>>
>>>> Hello Mahsa,
>>>>
>>>> If you google "biosemi channel location files", the first link
>>>> should be Head Caps from Biosemi, and there there is a downloadable
>>>> positions file for all their caps.
>>>> From there, you should be able to make a text loc file for their 32
>>>> channel montage.
>>>> Just make a text file that is formatted like other location files that
>>>> are already in the eeglab channel locations folder (sample_locs folder),
>>>> and you should be good to go.
>>>> It should have a label, and x y z coordinates, and then eeglab should
>>>> be able to read it with no problem via the Edit>  Channel locations import
>>>> function in the eeglab gui.
>>>> If you have trouble with that, send a copy of the file you made, and
>>>> one of the eeglab channel locs files, and detail any issues you had.
>>>>
>>>>
>>>>
>>>> On Wed, Sep 20, 2017 at 11:46 AM, mahsa shalchy <
>>>> mahsa.shalchy at gmail.com> wrote:
>>>>
>>>>> Dear list,
>>>>>
>>>>> Could anyone kindly share ".loc" file of 32 channel layout with me? I
>>>>> failed to extract the file using Biosemi xls coordinates and unfortunately
>>>>> links that I found on the forum archive are broken.
>>>>>
>>>>> Many thanks,
>>>>> Mahsa
>>>>>
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>>>>>
>>>>
>>>>
>>>
>>
>
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