A technological invention called electroencephalogram (EEG) has enabled scientists to have a deep understanding of sleep.
With the breakthrough progress, the application of this technology can objectively observe and measure people's waking and sleeping States, and can be used for
People find the changes of brain activity in different periods during a whole night's sleep. From this we can know that sleep is divided into different stages.
Yes, each stage has its own unique EEG activity and behavior characteristics. This discovery is regarded as psychology.
An important milestone in development. EEG records the average cluster potential (total potential) of neurons in a certain part of the brain.
Potential). In the process of sleeping at night, EEG shows regular changes. According to its different characteristics, sleep can be divided into
It can be divided into two types, namely slow wave sleep (SWS) and fast wave sleep (FWS). Sleep researchers not only record the EEG activity of sleepers, but also record other physiological indexes of subjects, such as eye movements.
Dynamic and respiratory activities, heart rate, muscle tension of a certain part of the body, etc. , thus giving a detailed and complete sleep at different stages.
The behavior characteristics of the surface are described and different names are given. Slow-wave sleep: Before a person's normal sleep begins all night, he or she is awake and relaxed and ready to fall asleep.
At this time, its EEG shows 8 Hz to 13 Hz alpha wave, which is usually when people are awake, quiet and close their eyes.
One inch can record the characteristic waves in the depths of his heart in one state. When a person begins to fall asleep, he or she first enters the first stage of sleep, which is called sleep 1, also known as sleep.
Sleep period. At this time, the EEG has a θ wave of 4hz ~ 7hz, and the overall brain activity is still active, but its level is gradually increasing.
Gradually decline, the brain wave shape presents an irregular sawtooth shape. Then enter the second stage of sleep-sleep stage 2, also known as shallow sleep stage. At this time, the most striking feature of EEG is appearance.
Sleep spindle wave and K- complex wave. The former is 12 Hz to 14, and the duration is more than half a second.
Hz burst wave, which is a sharp negative wave with high amplitude, followed by a positive wave with small amplitude and frequency. K- complex
Complex waves most often appear in the second stage of sleep and can be induced by sudden stimulation during sleep. People in shallow sleep may lose their hair.
Snoring, but if he (she) is awakened, he (she) often claims that he (she) is not asleep, but his behavior has shown the characteristics of sleeping. The next two stages are sleep stage 3 and sleep stage 4. The former is also called intermediate sleep stage, when EEG shows low frequency sum.
The characteristic of high amplitude is that besides θ wave, it also produces high amplitude slow wave (called δ wave) with frequency of 0.5Hz ~ 3Hz.
Δ wave becomes the characteristic brain wave in sleep stage 4, accounting for more than 50% of brain wave components. At this time, the sleeper enters a deep sleep period,
It's usually hard to wake up. In the process of continuous transition from 1 stage to 4 stages of sleep, various physiological indexes of sleepers change regularly, as follows
As the heart rate and breathing gradually slow down, the level of brain activity gradually decreases, and the brain wave components with low frequency and high amplitude in EEG gradually increase.
Gradually increase. The so-called slow-wave sleep is named according to the EEG characteristics of sleep stages 3 and 4. Guo Song consultation-psychology consulting guidance center
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-experts are by your side! The slow wave of EEG during sleep is caused by the synchronization of brain neuron activity. During waking or sleeping 1.
Section, the cerebral cortex receives a lot of stimulus input, and many neurons are in a very active state, but the parts and groups are different.
The exciting activities of neurons in the body do not happen at the same time, and the exciting activities one after another make the EEG present a waveform with high frequency and low amplitude.
But when people enter the third or fourth stage of sleep, the sensory input in the cerebral cortex is greatly reduced, and a small amount can reach the cerebral cortex.
Stimulation input can enhance the synchronous activity of neurons without interfering with each other, thus producing high amplitude and low amplitude.
The frequency of brain waves. After four stages of sleep, people gradually return to sleep stages 3 and 2, and if they are not awakened, they will enter another stage.
A unique sleep stage, namely the fast wave sleep stage. Guo Song consultation-psychology consulting guidance center
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