[Mne_analysis] need help to plot EEG topomaps with mne

[Jaakko Leppäkangas]

Hi Mathieu,
currently there is no way to project to 3d.

For the second point you could use a montage when reading the data. The
readers for EEG data have a montage parameter that you could use to set the
channel locations (see for example
http://mne-tools.github.io/dev/generated/mne.io.read_raw_edf.html#mne.io.read_raw_edf
and
http://mne-tools.github.io/dev/generated/mne.channels.read_montage.html#mne.channels.read_montage).
In your case, since you have some custom locations, one option would be to
manually add entries for 'OL' and 'OR' to the standard_1020.elc file, if
you know their locations.

-Jaakko

On 18 June 2016 at 20:56, Servant Mathieu <servant.mathieu at gmail.com> wrote:

> I'm new to mne, and would like to compute some topographic voltage maps
> from my EEG grand-averaged data.
>
> I have two specific questions:
> (i) The plot_topomap function plots 2D maps. Is there a way to plot 3D
> maps?
> (ii) My data_ is a 19 (electrodes) x 300 (datapoints) numpy array.
> Sampling rate was 250 Hz, and the 300 datapoints correspond to a -200 1000
> ms epoch (0 being the stimulus-locking event).
> -Is there a simple way to plot topographies at say, 300 ms after stimulus
> onset, or topographies over the average of a given time window (300-500ms
> after stimulus onset)?
> -I need to provide the (x,y) coordinates for each EEG channel. My channels
> are:
> electrodes =
> ['F3','F4','C3','C4','P3','P4','PO3','PO4','O1','O2','OL','OR','T3','T4','T5','T6','Fz','Cz','Pz']
> These electrodes are standard international 10/20 System sites, except OL
> (halfway between 01 and T5) and OL (halfway between 02 and T6). Given these
> locations, which coordinate array should I provide to the plot_topomap
> function ?
>
> Thanks for your help!
> Mathieu
>
>
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