[FieldTrip] Visualization of Channels for Human Connectome Project MEG data

[Schoffelen, J.M. (Jan Mathijs)]

Hi Tolga,

There’s a layout that ‘better fits’ the projected channel locations, and which you can obtain from the megconnectome software that accompanies the HCP MEG data. The software can be obtained from here: humanconnectome.org/documentation/MEG1/meg-pipeline.html<http://humanconnectome.org/documentation/MEG1/meg-pipeline.html>
If you download one of the packages and unzip it, you’ll find a ‘template’ directory. Inside, there’s a 4D248.mat file (note that you need the ‘4D248.mat’ in cfg.layout in that case), which you can use as a layout for visualization.

Best wishes,
Jan-Mathijs


On Mar 4, 2015, at 9:54 AM, Tolga Ozkurt <tolgaozkurt at gmail.com<mailto:tolgaozkurt at gmail.com>> wrote:

Dear Fieldtrip list,

I was seeing the MEG files uploaded by “Human Connectome Project”, which seem to be pre-processed by Fieldtrip. The resting data were collected in supine position with 4D Neuromag 248 channels.

When I use the standard command for layout

cfg.layout       = '4D248.lay';

the channel locations do not seem to fit. (Please see the attached figure). I do not quite know the channel distribution of the system; but it seems some channels are out of the head.

Could you give me an idea to project the channel layout properly?

Thank you.

Tolga

--
Tolga Esat Özkurt, PhD
Department of Health Informatics
Middle East Technical University
http://www.metu.edu.tr/~ozkurt/

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