[Mne_analysis] Issue when reading gdf files {Disarmed}

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

        External Email - Use Caution        

Hello!

I just downloaded the data sets from http://secure-web.cisco.com/1DOytGcgnH_P8b5xGsKj4GyC-qJRWmVl5VGHcYaQ6aBgFiDZnDkEhRRGVXi6IXSdMi0Ba3TYpOUGs9F5GYYBUtCxOLIFqnVZjo4cOO7__bLw59Ji2R_-4nqtNrdqVzekjvqYkeUrg2ML1WWm229kRH-bx7kU__Q0m_alyeCY1-UIQZMBCT30xG0GZlwn9rcV3mQ9RdOwaC5rqNSrUKdceMBbFoqW2jaK5qIxbYA3rlsAS8frjht2trTU2SJQoIVXN33-1ImaYQZkR4GZ_PwoHYA/http%3A%2F%2Fbbci.de%2Fcompetition%2Fiv%2Fdownload%2F and opened A01T.gdf and I cannot reproduce the problem; filter settings look OK, e.g. for A01T:

<Info | 7 non-empty values
 bads: []
 ch_names: EEG-Fz, EEG-0, EEG-1, EEG-2, EEG-3, EEG-4, EEG-5, EEG-C3, EEG-6, ...
 chs: 25 EEG
 custom_ref_applied: False
 highpass: 0.5 Hz
 lowpass: 100.0 Hz
 meas_date: 2005-01-17 12:00:00 UTC
 nchan: 25
 projs: []
 sfreq: 250.0 Hz
>

Where did you download the data and which data set shows this problem? It looks your file has been processed because it only contains 3 channels (as opposed to 25 in the original file).

Clemens


> On 27.11.2020, at 17:13, Apostolos Praftsiotis <apospraf at gmail.com> wrote:
> 
>         External Email - Use Caution        
> 
> 
> Hello everyone!
> 
> For the last month I've been toying around with the BCI IV 2a dataset and I noticed a weird behaviour when I used read_raw_gdf function to import the data. Particularly, when I tried to plot the gdf data the plot looked something like this:
> > raw = mne.io.read_raw.gdf(gdf_path)
> > raw.plot()
> <figure1.png>
> 
> Today, I noticed that in the MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be raw.info the lowpass and highpass values where switched
> > MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be raw.info
> <Info | 9 non-empty values
>  bads: []
>  ch_names: EEG:C3, EEG:Cz, EEG:C4
>  chs: 3 EEG
>  custom_ref_applied: False
>  file_id: 4 items (dict)
>  highpass: 100.0 Hz
>  lowpass: 0.5 Hz
>  meas_date: 2005-10-25 09:35:11 UTC
>  meas_id: 4 items (dict)
>  nchan: 3
>  projs: []
>  sfreq: 250.0 Hz
> 
> So, I switched the values of the filters and everything worked fine as shown below
> > MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be raw.info["highpass"] = 0.5
> > MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be raw.info["lowpass"] = 100
> > raw.plot()
> <figure2.png>
> 
> Am I doing something wrong when reading the gdf files? 
> 
> Regards,
> Apostolis
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