PhysioNet Challenge

[Nate Riek]

Hi,

I just wanted to confirm that the EEG data has a gain of 32/uV, so I will need to divide all EEG data by 32 in order to get to units of uV.

Thanks,

Nate

[PhysioNet Challenge]

Dear Nate,

Yes, you are correct: you can divide by gain in the WFDB header files to convert the digital signal data to the physical units of the analog signal data:
https://www.physionet.org/physiotools/wag/header-5.htm#sect3

In the current files, the gain is 32/uV, so you can divide the values in the MAT files by 32 to get values with units of uV.

You can also use the example code or the WFDB libraries to load the data and perform these steps for you automatically:
https://github.com/physionetchallenges/matlab-example-2023
https://github.com/physionetchallenges/python-example-2023
https://www.physionet.org/content/wfdb/

Best,
Matt
(On behalf of the Challenge team.)

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