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Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airborne sound waves, reducing their amplitude , for the purposes of noise reduction or noise control . [ 1 ] The energy is dissipated as heat . [ 2 ]
360-degree image of an acoustic anechoic chamber 360-degree image of an electromagnetic anechoic chamber. An anechoic chamber (an-echoic meaning "non-reflective" or "without echoes") is a room designed to stop reflections or echoes of either sound or electromagnetic waves.
Considering animals in which sleep-spindles were studied extensively (and thus excluding results mislead by pseudo-spindles [6]), they appear to have a conserved (across species) main frequency of roughly 9–16 Hz. Only in humans, rats and dogs is a difference in the intrinsic frequency of frontal and posterior spindles confirmed, however ...
REM is also referred to as paradoxical sleep because the sleeper, although exhibiting high-frequency EEG waves similar to a waking state, is harder to arouse than at any other sleep stage. [75] Vital signs indicate arousal and oxygen consumption by the brain is higher than when the sleeper is awake. [78]
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EEG recordings tend to show characteristic "sleep spindles", which are short bursts of high frequency brain activity, [6] and "K-complexes" during this stage. Stage 3 – previously divided into stages 3 and 4, is deep sleep, slow-wave sleep (SWS).
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