EEG Session 1: Reflective State

This page contains the data and analysis of a brain wave recording session I did using a Muse EEG Headband.

Session Characteristics

  • 30/09/2023, 22:18
  • I had slept a long nap and was feeling very calm and relaxed.
  • I was lying down in bed with my eyes open.
  • This session was immediately followed by Session 2, which was similar in everything except it was done with closed eyes. For a more complete comparison between the two sessions, visit the Session 2 page.

All Sensors

  • Given that I had my eyes open, the large oscillations led byDeltaare most likely from blinking. These are signal artifacts and shouldn’t be taken into consideration.

  • Zooming into a more stable portion (the green rectangles), where no oscillations occur, we can see thatAlphawas the most prominent frequency range during the session.
  • This relationship between frequencies looks more like what’s expected from a relaxed state (withAlpha,typically representing a more idling state, leading in dominance, while the fasterBetaandGammafrequencies having the lowest dominance).

Individual Sensors

  • Looking into each individual sensor, the same frequency relationship can be found in the Back sensors (TP10 and TP9).
  • In the Front sensors (AF7, AF8),Deltadominates instead. This might be an overrepresentation caused by blinking.
    • This is consistent with the fact that blinking artifacts are mostly detected in the front parts of the brain1.
    • Session 2, performed with eyes closed, will provide additional insights into this.
  • Below is the smoothed-out data from each of the sensors:

Absolute Average Values (All Sensors)

  • Deltaaverage: 67 dB
  • Alphaaverage: 65 dB
  • Thetaaverage: 57 dB
  • Betaaverage: 41 dB
  • Gammaaverage: 15 dB

Percentual Average Values (All Sensors)

  • Deltaaverage: 34%
  • Alphaaverage: 30%
  • Thetaaverage: 21%
  • Betaaverage: 10%
  • Gammaaverage: 3%

Brainwave Lateralization

Center of Gravity

For reference: the circle marks the central area of the brain. Activity inside it is more central and symmetrical; outside is more asymmetrical.

  • All centers of gravity are located inside or on the border of the central circle, indicating brain wave activity was fairly balanced across the four brain quadrants.
  • Delta’s center of gravity was contained within the central circle, with a lot of variability within it, with a preference for the Right side. From observing other sessions, I don’t usually see this type of behavior.
  • Theta’scenter of gravity was contained within the central circle, with a tendency towards the Right-Back quadrant.
  • Alpha’scenter of gravity was located on the circle border, with a slightly stronger pull towards the Right-Back quadrant.
  • Beta’scenter of gravity was located on the circle circle border, with a tendency towards the Left-Back quadrant.
  • Gamma’scenter of gravity was mostly contained within the central circle, with a tendency towards the Left-Back quadrant.

Stay Synced!

References:

  1. https://youtu.be/04fuXQ_D_bE?si=EC8qLqMsoSFSoLKt&t=192 ↩︎

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