mne_make_eeg_layout

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1

Hello,

I was trying to use the mne_make_eeg_layout to make a layout file of EEG electrodes, but when I opened the file I see few of the electrodes have same values, So I was thinking of doing the calculations manually.

I have 3-d co-ordinates of EEG electrodes read into Matlab from the raw fiff file and I'm trying to solve the projections of these locations into 2-d plane using the equations given under Creating a custom EEG layout http://www.martinos.org/mne/manual/utilities.html#chddgdja. when I plot the uk and vk in matlab, it doesn't look these are the projections. So I was wondering if someone could help regarding this. All I'm trying to do is calculate the projections of 3-d EEG electrodes into a 2-d plane.

Thanks and Regards,

2

Hi Santosh,

You said earlier that the EEG electrode positions have been scanned with a laser scanner. Are they in the Neuromag head coordinate system?

- Matti

3

Hello Matti,

I actually have two types of EEG electrodes, one obtained from the fiff file which was digitized using isotrak before the experiment and another one was obtained from the laser scanner which was then transformed into fiducial co-ordinate frame, even the fiducials were obtained from the laser scanner.

Thanks and Regards,