EEG Session 20: 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, 13:38
  • During this session, I was testing an advancedThetaisochronic tones track I created.
  • I was listening to the track with my eyes closed.
  • I started with a meditation session in silence to use as a reference, then added a brainwave entrainment track to it (this change is indicated by the symbol M1 in the graph)

All Sensors (Both Sessions)

  • Visually, both parts of the session seem to be similar in terms of the different brainwaves’ dominance. We’ll have to take a closer look.
  • Very highAlphadominance is to be expected since this is a relaxed session with my eyes closed.
  • Thetahas second-place dominance across most of the session. Since this behavior is also present in the first part of the session, we can exclude it as being a consequence of listening toThetaisochronic tones. We’ll keep looking for clearer signs of entrainment.

How Does Theta Dominance Increase Over Time?

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

  • Looking at the smoothed-out graph ofTheta dominance across time, we can see that it started at 14% and ended at 18% dominance, which signifies a 28% increase.
  • Since the first part of the session (meditation) was already showing an upward trend in dominance, we can’t say the isochronic tones were solely responsible for this increase, but they certainly didn’t hinder it.
  • However, if we look atThetadominance exclusively in the Front part of the brain (AF7, AF8), an even more interesting graph emerges.
  • As you see below,Thetadominance rose from 13.5% to 19.5% which is an increase of 69%.
  • Thetadominance in the Front part of the brain (known as Frontal Midline Theta) is associated with states of prefrontal-cortex activation, attention, focus, and memory, but also meditative states.
  • Notice how the increase inThetadominance reached a plateau at 18% dominance, and then the isochronic tones helped break it and reach 19.5% dominance (would probably go higher if I had continued with the session). This scores some points in favor of the entrainment qualities of the track ✅
  • We can look for other possible brainwave entrainment signs as we did in Session 19.

Right, Back Sensor (TP10, Both Sessions)

  • Unlike Session 19, there are no signs of an orderly, sinusoidal-like behavior of Gamma and Betain the TP10 sensor (or in any other sensor, for that matter).
  • This goes to show that not all brainwave entrainment tracks will affect the brain the same way, even if both tracks are similar and act exclusively on the same frequency range (Theta, in our case).
  • Let’s keep looking for signs of entrainment.

Other Signs of Entrainment (Dominance Percentages)

  • I have compiled in the image gallery below the most obvious instances where entrainment was found.
  • The graphs shown below show how dominant frequencies were across the session, in %.
  • M1 marks where the quiet meditation ends and the meditation with brainwave entrainment begins.
  • The differences will be obvious visually, but I’ll include some visual cues to help sometimes.
  • The gallery includes activity fromDelta@ Back (TP9, TP10),Theta@ Left-Back (TP9), Alpha@ Back (TP9, TP10), Beta@ Back (TP9, TP10), Gamma@ Back (TP9, TP10) and Gamma@ Front, Left (AF7)

Absolute Average Values (All Sensors)

  • Alphaaverage: 64 dB
  • Thetaaverage: 40 dB
  • Deltaaverage: 35 dB
  • Betaaverage: 34 dB
  • Gammaaverage: 11 dB

Percentual Average Values (All Sensors)

  • Alphaaverage: 51%
  • Thetaaverage: 17%
  • Deltaaverage: 14%
  • Betaaverage: 13%
  • Gammaaverage: 5%

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 CenterRight-Back quadrant.
  • Theta’scenter of gravity was located in the Center-Back quadrant.
  • Alpha’scenter of gravity was located far away in the CenterRight-Back quadrant.
  • Beta’scenter of gravity is located right at the border of the central circle, with an influencing pull from the Central-Back quadrant.
  • Gamma’scenter of gravity starts within the central circle near the Back border, and over time, it is pushed towards the Central-Back quadrant where Beta is located as well.

Get This Track

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

Learn More

Stay Synced!

Leave a Reply

Your email address will not be published.