[Mne_analysis] Get back a reference channel from acticap

[Brunner, Clemens (clemens.brunner@uni-graz.at)]

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Hi Sylvain!

Can you upload your file to your Dropbox or Google Drive and share the link?

In general, your approach makes sense to me, but I don't really understand why your Brainamp has an average reference electrode. This doesn't make sense, because an average reference is by definition the average of all involved channels, which means you cannot have a dedicated electrode for this. Maybe the data are collected with a FCz reference, and then they are re-referenced to average afterwards?

Anyway, I think the actual file would help us track down your issue.

Clemens



> On 16.10.2018, at 16:58, Sylvain <madec at uni-potsdam.de> wrote:
> 
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> 
> Ok here is the code for replicating the error:
> 
> 
> import mne
> import pandas as pd
> import numpy as np
> from mayavi import mlab
> %matplotlib inline
> %gui qt
> 
> 
> # Open EEG file
> data_path = '/home/sylvain/Desktop/Participant01'
> raw_fname = data_path + '/Participant01.vhdr'
> 
> ## Error further in the code (when adding reference channel) if I open the 
> file this way
> #raw_file = mne.io.read_raw_brainvision(raw_fname,
> #                                  event_id={"actiCAP Data On": 9999},
> #                                  montage = 'standard_1020',
> #                                  preload=True)
> 
> # The error diseapear if i just use this
> raw_file = mne.io.read_raw_brainvision(raw_fname,
>                                   event_id={"actiCAP Data On": 9999},
>                                   preload=True)
> 
> 
> raw_file = mne.io.add_reference_channels(raw_file, ['FCz'])
> 
> raw_file.set_montage('standard_1020')
> raw_file.plot_sensors()
> 
> 
> Do you know where I could stock the file it is quite big?
> 
> Thank you
> 
> Sylvain
> 
> On Tue, 16 Oct 2018 16:50:41 +0200
>  Alexandre Gramfort <alexandre.gramfort at inria.fr> wrote:
>>       External Email - Use Caution        
>> 
>> please share a file and code snippet so we better understand the 
>> issue
>> and we can document it and eventually help people not having this 
>> problem again.
>> 
>> if you have an issue, it's very likely someone else will have it 
>> too.
>> 
>> Alex
>> 
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> 
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