| Band | Frequency (Hz) | Normally |
|---|---|---|
| Theta | 4-8 | • Drowsiness in adults and teens |
| • Fatigue | ||
| Alpha | 8-12 | • Relaxed/reflecting |
| • Closing the eyes | ||
| Beta | 12-30 | • Range span: active calm → intense → stressed → mild obsessive |
| • Active thinking, focus, anxious | ||
| Gamma | 30-100 | • Excited |