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Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
Some electrophysiological studies have shown that neuronal activity patterns found during a learning task before sleep are reactivated in the brain during sleep. [86] This, along with the coincidence of active areas with areas responsible for memory have led to the theory that sleep might have some memory consolidation functions.
A sleep study is a test that records the activity of the body during sleep. There are five main types of sleep studies that use different methods to test for different sleep characteristics and disorders. These include simple sleep studies, polysomnography, multiple sleep latency tests (MSLTs), maintenance of wakefulness tests (MWTs), and home ...
It occurs during stage 2 NREM sleep. It is the "largest event in healthy human EEG". [1] They are more frequent in the first sleep cycles. K-complexes have two proposed functions: [1] first, suppressing cortical arousal in response to stimuli that the sleeping brain evaluates not to signal danger, and second, aiding sleep-based memory ...
The Multiple Sleep Latency Test (MSLT) measures a person's physiological tendency to fall asleep during a quiet period in terms of sleep latency, the amount of time it takes for someone. An MSLT is normally performed after a nocturnal polysomnography to ensure both an adequate duration of sleep and to exclude other sleep disorders.
Sleep outside of the REM phase may allow enzymes to repair brain cell damage caused by free radicals. High metabolic activity while awake damages the enzymes themselves, preventing efficient repair. This study observed the first evidence of brain damage in rats as a direct result of sleep deprivation. [42]
During sleep deprivation studies, a laboratory rat is housed in a water filled enclosure with a single small, dry platform (traditionally, an upside down flowerpot in a bucket of water, from which the technique is named) just above the water line (>1 cm). While in NREM sleep, the rat retains muscle tone and can
Neurophysiological studies have indicated a relationship between increased P-wave density during post-training REM sleep and learning performance. [20] [21] Basically, the abundance of PGO waves translates into longer periods of REM sleep, which thereby allows the brain to have longer periods where neuronal connections are formed.