AP PSYCHOLOGY

BIOLOGICAL BASES OF BEHAVIOR

BIOLOGY OF CONSCIOUSNESS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Sleep spindles show up during which sleep stage?
A
stage 1
B
stage 2
C
stage 3
D
REM
Explanation: 

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. Any abnormalities in these waveforms are therefore picked up on EEG.

Detailed explanation-2: -Sleep spindles may be present in all stages of NREM, but they are most prevalent in stage 2 sleep.

Detailed explanation-3: -They manifest as soon as we leave the transitionary state of sleep onset and enter the light phases of NREM sleep. From then on, they are generated regularly about every 3 to 6 seconds. Spindles occur during both light NREM sleep and deep slow-wave sleep, but not during REM sleep.

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.

Detailed explanation-5: -Sleep spindles begin to occur during Stage 2 sleep.

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