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Document reversed polarity #187

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isaacplotkin opened this issue Aug 16, 2023 · 1 comment
Open

Document reversed polarity #187

isaacplotkin opened this issue Aug 16, 2023 · 1 comment
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hardware more-info-needed Needs more information before attempting to resolve this issue. OpenBCI_GUI Relates to documenting the OpenBCI_GUI

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@isaacplotkin
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Users are confused why the raw EEG data has reversed polarity. We should explain why this happens and that they should reverse polarity in preprocessing if needed.

The reversed polarity was a conscious decision that allows us to design an ExG bio-sensing system since each channel can be individually configured. Here is a forum post that goes into more detail https://openbci.com/forum/index.php?p=/discussion/2042/polarity-of-erp-signal
@retiutut retiutut added OpenBCI_GUI Relates to documenting the OpenBCI_GUI hardware more-info-needed Needs more information before attempting to resolve this issue. labels Sep 20, 2023
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retiutut commented Sep 20, 2023 •
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Relates to data saved from the OpenBCI GUI. Though, we can also save data in BrainFlow CSV and BDF format.

Resolving this issue also means specifying if this is true for all data sent from the board, or just from the GUI.

^^^ This would determine which doc(s) to put the info.

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