EEG Session 11: Learning

This page contains the data and analysis of a brain wave recording session I did using a Muse Gen 1 EEG Headband.

Session Characteristics

  • 29/10/2023, 22:31
  • During this session, I was learning about topics that fascinate me, for about 25 minutes.
  • The topic was the Pyramids of Giza and its mathematical peculiarities.
  • At the same time, I was taking notes and writing them down in the software Obsidian.

All Sensors

  • Delta,Theta,Alphaand Beta form a tight band with similar energy levels and maintain that state for the whole session, which is not a kind of behavior I’ve observed before.
  • Betasometimes rises to first and second-place dominance, which rarely happens in the data for all sensors. This seems to be evidence that I was indeed engaged in my studies.
  • Next, let’s take a closer look at individual sensors.

Front-Left Sensor (AF7)

  • Betadominance prevails throughout the Front-Left quadrant throughout the whole session.
  • Gamma,for the first 10 minutes, also dominates in second place.
  • While it’s more common to seeBetaandGamma dominating the Front-Left quadrant, I still find it interesting how both these frequencies were able to achieve such high separation from slower bands and sustain it for about 10 minutes.

Front-Right Sensor (AF8)

  • Comparing to the AF7 sensor, activity in the Front-Right quadrant has some similarities but also some differences.
  • BetaandGamma also clearly dominate in the beginning of the session with a clear separation from slower frequencies. In fact, in terms of absolute energy levels (Y-axis) these two bands are higher than AF7.
  • However, this dominance changes after 6 minutes, where there is a large boost andDeltadominance and a largeGamma andBetadominance drop (which returns once again at the end of the session).
  • I have noticed in other sessions thatDeltaseems to behave like this in the Front-Right quadrant sometimes. As of now, I am still not sure what the significance of that is.

Back Sensors (TP9, TP10)

  • In the back sensors,Alphadominates andBetaandGammahave the lowest dominance, which seems to indicate those parts are more idle and the action is occurring in the front instead.

Absolute Average Values (All Sensors)

  • Alphaaverage: 62 dB
  • Betaaverage: 58 dB
  • Deltaaverage: 57 dB
  • Thetaaverage: 55 dB
  • Gammaaverage: 43 dB

Percentual Average Values (All Sensors)

  • Alphaaverage: 26%
  • Betaaverage: 22%
  • Deltaaverage: 21%
  • Thetaaverage: 20%
  • Gammaaverage: 11%

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.

  • Delta’scenter of gravity was located on the Right-Back quadrant.
  • Theta’scenter of gravity was located on the CenterRight-Back quadrant.
  • Alpha’scenter of gravity was located on the CenterRight-Back quadrant.
  • Beta’scenter of gravity was located in the central circle with a slight pull towards the CenterRight-Back quadrant.
  • Gamma’scenter of gravity was located in the central circle with a type of variability I haven’t found before. It’s hard to say where it’s getting its pulling force, but it’s safe to say that it’s located in the Right hemisphere and not the Left.

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