help for Bipolar Longitudinal montage ?

elizabethelizabeth los angeles
edited July 2020 in Software

I am looking at 16 channels and have no clue how to interpret the data. It seems it links to the knowledge of basic Electroencephalogram knowledge. I cannot find any descriptions on the internet to interpret data.

Comments

  • wjcroftwjcroft Mount Shasta, CA
    edited July 2020

    Elizabeth, hi.

    Please see this related thread and links therein. By default, almost all EEG systems (except clinical types used for epilepsy), use a 'referential' montage, with one electrode acting as common reference for all other electrodes. On Cyton this reference is the SRB2 pin (closest to board).

    https://openbci.com/forum/index.php?p=/discussion/1840/cyton-bipolar-montage

    Much easier than the Y-cable wiring suggested in the above link, would be to just derive the bipolar / longitudinal montage, via a mathematical re-referencing. There are EEG apps that can help with this.

    https://www.google.com/search?q=eeg+re-referencing

    http://www.neuro.mcw.edu/meg/index.php/EEG_re-reference_with_Brainstorm

    Regards, William

  • There are resources on the www, or check a medical school library if one is nearby. Here is one on the web:

    http://www.brainm.com/software/pubs/brain/Handbook of EEG Interpretation.pdf

  • elizabethelizabeth los angeles





    I found the other info, in case anybody is interested.

  • Keep in mind that the scalp EEG (ignoring the event potentials like P300) reflects for the most part a sort of carrier wave resting potential activity of the brain beneath the electrodes. So I would not generally expect a given set of waves you detect with your 16 lead Cyton device to connect in a reliable way to the activities listed in the charts above in that electrode position of the head. For example, when using motor EEG activity to detect motor cortical activity, we may look for a decrease, not an increase in amplitude to indicate extra processing by that part of the brain, since the extra processing causes a desynchronization of waves which may drop the overall amplitudes.

  • elizabethelizabeth los angeles

    Thank you. I want to learn as much as I can get for my own knowledge to have a big picture of what happens in a brain. The more I know the better I feel.

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