What is the strongest brain signal "strength" capable of being generated by the body

edited July 2018 in Research
I am reviewing the signals that I have recorded using my Cyton, Daisy, and Ultra-cortex Headset in MATLAB and have noticed that some signals have higher amplitudes than others. I have concatenated 31 samples together, and reviewed them using MATLAB code that calculates all of the frequencies that make up the signals, and their amplitudes (power).  Out a sampling of over 2.8 Million, 4/5 of them have a magnitude less than 1.  The remaining range from 1 to 51.

This makes me wonder:
  1. What is the strongest signal strength that can be generated by the brain?
  2. What frequencies are naturally generated by the brain?
Can anyone shed some light on this? Or point me in the right direction of some research?

Does anyone have some recordings that they would like to share with me?  I'd like to compare recordings.

Thanks,
Don

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Don, hi.

    Checkout this short video describing what is shown on a QEEG (quantitative EEG) map. Such maps compare a measured client's brainwaves (at 19 sites), to a standardized (normative) database based on 'normal' individuals of the same age and gender.



    You can also find many other pages on QEEG with a web search.

    Typically the QEEG shows that the alpha and delta bands have the highest amplitude. Depending on the activity and state of the person being measured.

    Unfortunately QEEG requires 19 channel EEG equipment and specialized software that compares the measured client to the database. These items are expensive, generally in the thousands of dollars. I know of no current open source QEEG projects.

    Just using the OpenBCI GUI, FFT graph, you can see the alpha show up when you close your eyes, at 10 hz. 

    There are some sites out on the web with collections of EEG data.


    Regards,

    William

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