[FieldTrip] NeuroMag 389 channel map

[anne Hauswald]

Hi Mona,

as said, the layout files are mainly meant for 2-d plotting. Here http://www.fieldtriptoolbox.org/template/layout under „Neuromag array“ you find specifics for the different files. 
- neuromag306all.lay includes all 306 sensors 
- neuromag306mag.lay includes all 102 magnetometers
- neuromag306cmb.lay includes 102 positions of 204 combined gradiometers (two at each position)
- neuromag306planar.lay includes 204 positions of all planar gradiometers
- neuromag306eeg1005_natmeg.lay includes 128 EEG positions

Basically, with the Neuromag system you have 102 sensor elements with three sensors each (1 magnetometer and two orthogonal planar gradiometers).

Hoper that helps
Best Anne

> 
> 	I’m not sure what the neuromag306eeg1005_natmeg.lay and neuromag306cmb.lay


> Am 13.01.2017 um 19:20 schrieb Wong-Barnum, Mona <mona at sdsc.edu>:
> 
> 
> Hi Anne:
> 
> 	Thank you so much for your reply.
> 
>> generally you should be fine using the positions of only the MEG channels, as the location of the EEG channels is user specific. Depending on the purpose, you might be good with the layout file that is stored in the template/layout folder of field trip, neuromag306mag.lay, neuromag306all.lay or neuromag306cmb.lay. This works fine for stuff like plotting the topographies.
> 
> 	Is there an explanation of the 5 different neuromag layout files?  I have the following:
> 
> neuromag306all.lay  neuromag306eeg1005_natmeg.lay  neuromag306planar.lay
> neuromag306cmb.lay  neuromag306mag.lay
> 
> 	I’m not sure what the neuromag306eeg1005_natmeg.lay and neuromag306cmb.lay files are for.
> 
> 	I found http://www.fieldtriptoolbox.org/tutorial/layout page but if there is anything that’s useful, please point me to it.
> 
> thanks,
> Mona
> 
> *********************************************
>    Mona Wong
>    Web & Mobile Application Developer
>    San Diego Supercomputer Center
> 
>    "Believe you can and you are half
>    way there."
> 			-- Theodore Roosevelt
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