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A summary of EEG data.
| Frequency band | Frequency range (Hz) | Describe |
|---|---|---|
| α | 8–13 | Appear in a relaxed state |
| β | 14–30 | Appear in a state of tension |
| δ | 1–3 | Appear in a state of extreme exertion |
| γ | 31–50 | Appear in a state of concentration |
| θ | 4–7 | Occurs in people with mental illness |
