[Mne_analysis] Issue when reading gdf files {Disarmed}

[Apostolos Praftsiotis]

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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()*
[image: figure1.png]

Today, I noticed that in the raw.info the lowpass and highpass values where
switched
*> raw.info <http://secure-web.cisco.com/1tf0jte3giT4_FYAKjyvbNhol4wm9ZVoZ5Eb-cFanIfJoQCtmSz6mz_3EJ1fGdOgXmvos8bfMyexQxmytKbVHgvTvKhSY3R0dR8vnYVtu7EFCDa5PxbSvepOe-obq-tgYcmfHLoi6pnCKAOzLdtLtKMANmylz8o1nbSTg5iAwb25QtDzRQCCFmUQh0hMHzvWhTNpkVD6F1IweswHL-Rz7cyQ5ZFIAGArw8_3reKmvkpV6Y97VaF7CiBU0LRquSB5C6SFjDcnSjPrbRYCxUGXqig/http%3A%2F%2Fraw.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
*> raw.info <http://secure-web.cisco.com/1tf0jte3giT4_FYAKjyvbNhol4wm9ZVoZ5Eb-cFanIfJoQCtmSz6mz_3EJ1fGdOgXmvos8bfMyexQxmytKbVHgvTvKhSY3R0dR8vnYVtu7EFCDa5PxbSvepOe-obq-tgYcmfHLoi6pnCKAOzLdtLtKMANmylz8o1nbSTg5iAwb25QtDzRQCCFmUQh0hMHzvWhTNpkVD6F1IweswHL-Rz7cyQ5ZFIAGArw8_3reKmvkpV6Y97VaF7CiBU0LRquSB5C6SFjDcnSjPrbRYCxUGXqig/http%3A%2F%2Fraw.info>["highpass"] = 0.5*
*> raw.info <http://secure-web.cisco.com/1tf0jte3giT4_FYAKjyvbNhol4wm9ZVoZ5Eb-cFanIfJoQCtmSz6mz_3EJ1fGdOgXmvos8bfMyexQxmytKbVHgvTvKhSY3R0dR8vnYVtu7EFCDa5PxbSvepOe-obq-tgYcmfHLoi6pnCKAOzLdtLtKMANmylz8o1nbSTg5iAwb25QtDzRQCCFmUQh0hMHzvWhTNpkVD6F1IweswHL-Rz7cyQ5ZFIAGArw8_3reKmvkpV6Y97VaF7CiBU0LRquSB5C6SFjDcnSjPrbRYCxUGXqig/http%3A%2F%2Fraw.info>["lowpass"] = 100*
*> raw.plot()*
[image: figure2.png]

Am I doing something wrong when reading the gdf files?

Regards,
Apostolis
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