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In a Geiger counter, a particle produced by radioactive decay
Delta Waves
Low frequency brain waves that indicate deep sleep or meditation.
Alpha Waves
Brainwave patterns associated with a state of wakeful relaxation.
Sleep Spindles
Bursts of oscillatory brain activity visible on an EEG that occur during stage 2 of non-REM sleep, often associated with learning, memory, and the brain's ability to reorganize itself.
Sleep Patterns
The habitual resting and waking rhythm that determines when one sleeps and the quality and duration of sleep.
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