Troubles in show bdf files

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1
  • MNE version: 1.5.1
  • operating system: Windows 11

I just use mne.io.read_raw_bdf to read bdf files, the files can be successfully read. But, when I plot the EEG signals, the signals look very strange. Could anyone tell me why and how to solve this problem?

raw = mne.io.read_raw_bdf(data_path, preload=True)
raw.plot()

mne_eeg_plot
mne_eeg_plot2559×1333 159 KB

2

Your signals seem to be scaled incorrectly. MNE-Python expects EEG to be in V, but your signal might be in µV. Therefore, you need to multiply them by 1e-6 after importing.

See also here: Need help in plotting raw eeg signals using raw.plot() - #6 by cbrnr

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3

Thanks for your help!

4

How to multiply raw data? I got an error when raw=raw*1e-6.

5

Unfortunately, there is no easy-to-find rescale method, but you can use:

raw.apply_function(lambda x: x * 1e-6, picks="eeg")
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