Brainwaves are categorized by frequency and indirectly by function.
Beta brainwaves (13-40 Hz) are associated with active thinking and concentration.
Alpha brainwaves (7-13 Hz) are associated with relaxation and drowsiness.
Theta brainwaves (4-7 Hz) are associated with dreams, meditation, and REM sleep.
Delta brainwaves are associated with deep sleep.
Beta brainwaves (13-40 Hz) are associated with active thinking and concentration.
Alpha brainwaves (7-13 Hz) are associated with relaxation and drowsiness.
Theta brainwaves (4-7 Hz) are associated with dreams, meditation, and REM sleep.
Delta brainwaves are associated with deep sleep.
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