STATES OF CONSCIOUSNESS
PSYCHOLOGY OF SLEEP
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Stage 4
|
|
|
Stage 3
|
|
|
Stage 1
|
|
|
Stage 2
|
Detailed explanation-1: -The second stage of NREM sleep on EEG shows theta waves, which, along with K-complexes and sleep spindles, are the defining characteristics of this stage.
Detailed explanation-2: -Sleep spindles may be present in all stages of NREM, but they are most prevalent in stage 2 sleep. View Source, which we tend to enter for the first time shortly after falling asleep. Sleep spindles do not occur during REM sleep.
Detailed explanation-3: -Sleep spindles are bursts of coherent brain activity visible on the EEG, which are most evident during stage 2 sleep. They consist of brief 11-to 16-Hz waves lasting 0.5–1.5 s.
Detailed explanation-4: -Stage II is the predominant sleep stage during a normal night’s sleep. The distinct and principal EEG criterion to establish stage II sleep is the appearance of sleep spindles or K complexes. The presence of sleep spindles is necessary and sufficient to define stage II sleep.