[Mne_analysis] Topomap with Brainvision EEG data

[Lakshmi Krishnan]

Hi Denis,
I was hesitant to use real data since the electrode locations didn't match.
I read the brain vision eeg files into mne-python using mne.io.read_raw_brainvision.
I couldn't figure out how to set up the electrode location information in the rawData,since I don't have any additional localization file.
On another note,if I had nothing but the EEG data(with the std electrode locations) it is hard to use most of the inverse methods in mne-python, is that right?
Thanks!
-Lakshmi
________________________________
From: mne_analysis-bounces at nmr.mgh.harvard.edu [mne_analysis-bounces at nmr.mgh.harvard.edu] on behalf of Denis-Alexander Engemann [denis.engemann at gmail.com]
Sent: Thursday, October 30, 2014 4:12 PM
To: Discussion and support forum for the users of MNE Software
Subject: Re: [Mne_analysis] Topomap with Brainvision EEG data

Hi Lakshmi,

Generally it would be better to use actual data, not randomly generated data to compare both routines.
Obviously the locations are different.
Do you happen to use any importing routine to get your data into MNE?
Which kind of data format do you use, natively?
The viz function you're using is quite low level and normally expects preprocessed channel locations.
We'll have a mini MNE sprint tomorrow in Paris on EEG, montages and io functionality.
We'll take a look at your case and get back to you.

Best,
Denis


2014-10-30 21:02 GMT+01:00 Lakshmi Krishnan <lakshmik at umd.edu<mailto:lakshmik at umd.edu>>:

Hi Denis,
Here is the link to sample sample scripts and figures for generating the topomap with a eeglab utility function and mne-python.

https://copy.com/djUllqUXi3lfSaiV

The matlab topoplot matches the figures provided by Brain vision in their documentation.I would be happy to use any other channel location file that's known to work with Brain Vision EEG data.
Thanks!
-Lakshmi
________________________________
From: mne_analysis-bounces at nmr.mgh.harvard.edu<mailto:mne_analysis-bounces at nmr.mgh.harvard.edu> [mne_analysis-bounces at nmr.mgh.harvard.edu<mailto:mne_analysis-bounces at nmr.mgh.harvard.edu>] on behalf of Denis-Alexander Engemann [denis.engemann at gmail.com<mailto:denis.engemann at gmail.com>]
Sent: Thursday, October 30, 2014 9:27 AM
To: Discussion and support forum for the users of MNE Software
Subject: Re: [Mne_analysis] Topomap with Brainvision EEG data

Hi Lakshmi,

could you possibly share data snippets, an example script and maybe the different figures that you see?
Otherwise it will be difficult to understand what's wrong.

--Denis

2014-10-30 14:23 GMT+01:00 Lakshmi Krishnan <lakshmik at umd.edu<mailto:lakshmik at umd.edu>>:
Hello List,
I am trying to port all my Matlab analysis scripts into python and have trouble making a topomap with EEG data collected from a Brainvision system.
I am trying to use mne.viz.plot_topomap() with the channel location information that I know works with eeglab topoplot.
The resulting plot doesn't match the topomap I make with Matlab.
Any help to resolve this is much appreciated.
I am using mne version 0.9 from github.
Thanks!
-Lakshmi

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