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Characteristics of brain waves.
| Brainwaves | Description | Frequency Interval | Location |
|---|---|---|---|
| Gamma | Refers to hyper-vigilance state | >30 Hz | — |
| Beta | Refers to alert state | 13 to 30 Hz | Frontal and Central |
| Alpha | Refers to waking state | 8 to 13 Hz | Frontal and Occipital |
| Theta | Refers to the half-sleep | 4 to 7 Hz | Temporal and Median |
| Alpha-Theta | Refers to waking and relaxation states | 5 to 9 Hz | Temporal and Occipital |
| Delta | Refers to consciousness and sleep states | 0.5 to 4 Hz | Frontal lobe |
