The brainwaves are divided into five kinds of rhythms based on their frequencies. They are α wave, β wave, θ wave, δ wave, and γ wave. When your brain is in different states, the percentage changes. Through frequency domain analysis of real-time brainwaves, we'll know the power ratio of each brainwave. The change of their percentage reflects the change of brain states.
Power ratio of each brainwave frequency
<aside> 📢 There are slight discrepancies in the frequency bands of the brainwave rhythm reported on different papers. The frequency band adopted in our algorithm is based on below. [1]
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Besides, the ratio varies from person to person, related to gender and age, etc. [234]
Brainwave rhythm energy can be expressed as an absolute value (in dB) or a relative value (scale). Following is a typical case from a young man at the age of 28 when he was awake with his eyes open: β waves are dominant (30%-40%), θ waves the second (25-35%), α waves the third (20%-30%), γ waves the fourth (around 10%) and δ waves the last (below 10%).
<aside> 📌 The ratio may be different from the result made through clinic or other devices as the data profoundly depends on the device's sensitivity to the frequency and the sensor placement.
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