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. 
Besides, the ratio varies from person to person, related to gender and age, etc. 
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.