EEG Session 19: Theta Isochronic Tones

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

Session Characteristics

  • 09/11/2023, 13:17
  • During this session, I was testing an advancedThetaisochronic tones track I created.
  • I was listening to the track with my eyes open.

All Sensors

  • Looking at the data from all sensors, we can see thatAlphadominated, followed by a band comprised ofTheta,Delta,andBeta,and then finally a lower isolatedGammaband.
  • Zooming in for more clarity, we can see thatThetahas second-place dominance across most of the session. This dominance might be a direct consequence of listening toThetaisochronic tones, or it might simply be due to me being in a relaxed, idling state. Let’s keep searching for other entrainment markers.

How Did Dominance Percentages Change Over Time?

The graphs shown below show how dominant frequencies were across the session, in %.

  • BetaandGammahad a slight increase in dominance across all brain quadrants. Averaging the data from all sensors we can say that:
    • Betawent from 13.3% to 16.9% dominance, corresponding to a 27% increase.
    • Gammawent from 4.7% to 5.7% dominance, corresponding to a 21% increase.
  • Deltadecreased in dominance across all brain quadrants, averaging about -24%.
  • Alphahad a slight decrease in dominance of about -7% in all sensors except in the Front-Left (AF7), where it had a 40% increase.
  • Thetahad a very slight dominance increase of 5% in the Front-Left (AF7) and Right-Back (TP10) sensors, and remained stable in the other two.
  • Plenty otherTheta entrainment tracks I’ve analyzed have resulted in more interesting changes in dominance. However, this doesn’t mean this track wasn’t able to entrain the brain. Let’s take a look at the next section.

Right-Back Sensor (TP10)

  • Looking at the Right-Back quadrant, a clear sign of entrainment is found ✅
  • I’m referring to the behavior of theGammafrequency range — an oscillating sinusoidal pattern with sustained and consistent peaks and valleys.
  • This type of orderly behavior has never been observed in any other session that doesn’t involve brainwave entrainment. For reference, below is an image showing what typicalGammabehavior looks like. Simply put, it looks much more unpredictable and chaotic.
  • If we look even closer at the brainwaves, we see thatBetaalso seems to be showing signs of entrainment in the TP10 sensor, in a way that is synchronized withGamma.

Absolute Average Values (All Sensors)

  • Alphaaverage: 68 dB
  • Thetaaverage: 55 dB
  • Deltaaverage: 50 dB
  • Betaaverage: 45 dB
  • Gammaaverage: 19 dB

Percentual Average Values (All Sensors)

  • Alphaaverage: 41 %
  • Thetaaverage: 22 %
  • Deltaaverage: 19%
  • Betaaverage: 14 %
  • Gammaaverage: 4 %
  • Here, we confirm thatThetahas indeed second-place dominance during the session.

Brainwave Lateralization

Center of Gravity

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

  • Delta’s center of gravity was located in the CenterLeft-Back quadrant. This is the first time I seeDeltabeing pulled towards this quadrant. This is also the first session where I analyze a brainwave entrainment track, so it could possibly stem from that,
  • Theta’scenter of gravity was located in the Center-Back quadrant.
  • Alpha’scenter of gravity was located in the CenterRight-Back quadrant.
  • Beta’scenter of gravity was located in the CenterRight-Back quadrant.
  • Gamma’scenter of gravity is located at the border of the central circle, with an influencing pull from the Right-Back quadrant.

Get This Track

If you are interested in trying this track, you can get it as part of the NEX: Brainwave Entrainment Bundle

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