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Table 1 Characteristics of each rhythm wave

From: Application of music in relief of driving fatigue based on EEG signals

Rhythm wave Frequency (Hz) Amplitude (μV) Main appearing area Representational state
δ 0.5–4 10–20 Forehead During sleep and deep anesthesia, table depression
θ 4–8 20–40 Parietal and temporal lobes Depressed mood, drowsiness, depression
α 8–12 10–100 Parietal lobe and occipital lobe Appears when awake, expresses excitement
β 12–30 5–30 Frontal and temporal Appears when emotional, expresses excitement