Question at position 21 During which stage of sleep would you find sleep spindles and K-complexes?Stage 1Stage 2Slow-wave sleepREMClear my selection单项选择题
A
Stage 1
B
Stage 2
C
Slow-wave sleep
D
REM

Question

Question at position 21 During which stage of sleep would you find sleep spindles and K-complexes?Stage 1Stage 2Slow-wave sleepREMClear my selection

BlackTom AI · Accepted Answer

Sleep spindles and K-complexes are hallmark features of Stage 2 (N2) non-REM sleep.

Relevant knowledge points:
- Sleep is classified into wake, NREM (Stages N1, N2, N3) and REM. Each stage has characteristic EEG patterns.
- Stage 1 (N1): transition from wake to sleep; low-amplitude, mixed-frequency activity often with theta waves (4–7 Hz).
- Stage 2 (N2): presence of sleep spindles (brief bursts ~12–14 Hz) and K-complexes (single large biphasic waves) on EEG; light to moderate sleep.
- Slow-wave sleep (N3): high-amplitude, low-frequency delta waves (0.5–2 Hz), sometimes called deep sleep.
- REM: EEG resembles wakefulness (desynchronized), with rapid eye movements and muscle atonia.

Step-by-step reasoning:
1. Identify the EEG markers in the question: sleep spindles and K-complexes.
2. Match these markers to the known stage: sleep spindles (12–14 Hz) and K-complexes are classically described in Stage 2 sleep.
3. Check alternatives:
   - Stage 1: lacks spindles and K-complexes; characterized by theta activity and vertex waves.
   - Slow-wave sleep (N3): dominated by delta waves, not spindles/K-complexes.
   - REM: shows low-voltage, mixed-frequency EEG similar to wake; no K-complexes or typical sleep spindles.

Why the correct answer is correct:
Sleep spindles are generated by thalamocortical circuits and appear as brief bursts during N2; K-complexes often occur spontaneously or in response to stimuli during N2 and help protect sleep by suppressing cortical arousal. These two patterns together are diagnostic for Stage 2 sleep.

Why other options are incorrect:
- Stage 1: no spindles/K-complexes, just theta transition.
- Slow-wave sleep: dominated by delta waves (deep sleep).
- REM: EEG desynchronized with rapid eye movements and muscle atonia, not spindles/K-complexes.

Conclusion: The correct stage containing sleep spindles and K-complexes is Stage 2, which matches the provided answer.

Question at position 21 During which stage of sleep would you find sleep spindles and K-complexes?Stage 1Stage 2Slow-wave sleepREMClear my selection单项选择题

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