From: Mental state and emotion detection from musically stimulated EEG
Brainwave | Frequency range (Hz) | Amplitude (μV) | Mental function |
---|---|---|---|
\(\delta\) | 0–4 | 10–100 | Unconsciousness during a deep dreamless sleep |
During a deep dreamless sleep | |||
\(\theta\) | 4–8 | 10–50 | Subconscious mind |
Focused attention | |||
Emotion responses | |||
\(\alpha\) | 8–12 | 5–25 | Relaxed mental state |
\(\beta 1\) | 12–16 | 0.1–1 | Intense focused mental activity |
\(\beta 2\) | 16–30 | < 0.1 | Anxious alert |
\(\gamma\) | 30–99 | ≪ 0.1 | Hyper brain activity |