"Isotrak not found" after converting edf to fif

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1

Hi mne community,

I have a PSG dataset in EDF+ format that I processed and then wrote back to disk in MNE’s fif format.

The only things i did were harmonizing the channel labels (some were slightly deviating from the others) and adding the correct channel types (['eeg', 'emg', 'misc', 'eog', 'ecg'])

When loading one of the new .fif files using mne.io.read_raw_fif() I’m getting the following output:

Opening raw data file <filename>_raw.fif...
Isotrak not found
    Range : 0 ... 4445951 =      0.000 ... 17366.996 secs
Ready.

What is the meaning of “Isotrak not found”? Google indicates it might be related to digitization in some form, but as far as I know this was never done for my dataset. Can I ignore this message? Is there anything I should be aware of?

2

You can, it means this FIF file does not contain a digitization which is correct if your EDF/input when you saved the FIF file did not have one.

3

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