10/25/2022 0 Comments Difference between rem and deep sleep![]() ![]() Delta waves appear and soon account for nearly half of the waves in the EEG trace. Stage Three non-REM sleep marks the passage from moderately to deep sleep. The K-complex seems to be associated with brief awakenings, often in response to external stimuli. They are generated by interactions between thalamic and cortical neurons.ĭuring Stage Two sleep, the EEG trace may also show a fast, high-amplitude wave form called a K-complex. Sleep spindles generally last one to two seconds. These bursts of activity have a frequency of eight to fourteen Hz and an amplitude of 50 to 150 µV. #DIFFERENCE BETWEEN REM AND DEEP SLEEP SERIES#The theta waves characteristic of Stage Two sleep are interrupted by occasional series of high-frequency waves known as sleep spindles. Stage Two non-REM sleep is a stage of light sleep in which the frequency of the EEG trace decreases further while its amplitude increases. Each period of Stage One sleep generally lasts three to twelve minutes. They also often report having had stray thoughts and short dreams. In experiments where people are awakened from Stage 1 sleep and asked about their state of consciousness, they usually report that they had just fallen asleep or had been in the process of doing so. ![]() Though your reactions to stimuli from the outside world diminish, Stage One is still the phase of sleep from which it is easiest to wake someone up. Soon, the even slower theta waves begin to emerge. Then, as you continue falling asleep, the rapid beta waves of wakefulness are replaced by the slower alpha waves of someone who is relaxed with their eyes closed. After a few sudden, sharp muscle contractions in the legs, the muscles relax. Stage One non-REM sleep begins when you first lie down and close your eyes. Obviously, falling into a deeper and deeper sleep as the night progresses is actually a gradual, continuous process, but these four stages still provide a convenient means of describing the relative depth of non-REM sleep. These four types of brain waves, and others discussed below, are important criteria that have been used to define four distinct stages of non-REM sleep. Lastly, when there are no brain waves present, the EEG shows a flat-line trace, which is a clinical sign of brain death.Delta waves are observed when individuals are in deep sleep or in a coma. Delta waves: range from 0.5 to three or four Hz in frequency and 100 to 200 µV in amplitude.Theta waves are associated with memory, emotions, and activity in the limbic system. Theta waves: have a frequency range from three to eight Hz and an amplitude of 50 to 100 µV.Alpha waves are typically found in people who are awake but have their eyes closed and are relaxing or meditating. Alpha waves: have a frequency range from eight to twelve Hz and an amplitude of 30 to 50 µV. ![]() Some scientists distinguish the range above 30-35 Hz as gamma waves, which may be related to consciousness–that is, the making of connections among various parts of the brain in order to form coherent concepts. Beta waves are the ones registered on an EEG when the subject is awake, alert, and actively processing information.
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