Friday, December 19, 2008


Types of Brainwaves

Brainwaves are produced by our brains in whatever state of consciousness we are in: waking, sleeping, daydreaming, solving mathematical equations, dancing, singing, etc.. These brainwaves are measurable as electrical signals using a device called EEG (electroencephalogram).

There are four types of brainwaves and they differ in frequency ranges. The table below illustrates the brainwave types, the frequency range and a brief description.

BETA 13hz-38hz This occurs when we are fully awake. 2-20microvolts
ALPHA 8hz-13hz Occurs when you are relaxed and not doing any major mental work. 20-60microvolts
THETA 4hz-8hz Light sleep 20-100microvolts
DELTA 0.5hz-4hz Deep sleep. 20-200microvolts

The frequency range tells us how many times a brainwave pulses in 1 second expressed in hertz (hz). The fully awake state(beta) has the highest frequency range and gets slower as it goes to the sleep state (delta). As the frequency goes lower the amplitude or strength of the pulses goes higher.

The voltage levels (amplitude) are so small that they are measured in microvolts (millionths of a volt).

BETA beta waves
ALPHA alpha waves
THETA  theta waves
DELTA  delta waves

The waveforms presented above are uniform in shape for simplicity and does not represent the actual pattern as seen from an electroencephalograph as shown below.

brain waves eeg

Dominant Brainwaves

When we are in the waking state or fully awake, we are in beta but it does not mean that there are no activities from the the other wave types. It's just the beta brainwaves are dominant and the rest have small signals or little activity. Likewise if you are in the alpha state, the dominant brainwave pattern is the alpha type while the rest are somewhat in the background but still performing the necessary functions for our body.

Isochronic Tones

Using isochronic tones, we can selectively make certain brainwaves dominant. Some frequencies enhance our focus and concentration while some silence our conscious murmurs, and bring us to a meditative state.

Only a few minutes of listening to an isochronic tone can bring us to a desired state. A meditative state can be achieved much faster, memory can be improved, sleep much better, etc.

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