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Even professional editors and grammarians sometimes disagree about correct usage.
Theta Waves
Brain wave patterns observed in the EEG (Electroencephalogram) that are typically associated with light sleep, meditation, and creativity, having a frequency range of about 4-8 Hz.
Alpha Waves
A type of brainwave that is associated with relaxed, calm, and meditative states, typically with closed eyes.
Beta Waves
Brainwave patterns associated with active, alert states of consciousness.
Sleep Spindles
Sleep Stage 2 brain waves that feature short periods of calm interrupted by brief flashes of intense activity.
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