Question at position 2 Sleep spindles and K-complexes are often associated with stage 1 sleep.Sleep spindles and K-complexes are often associated with stage 1 sleep.TrueFalse题目解析X解答完成正在帮您自动填写... 自动填写将优先使用云端题库答案可能与解析结果有所不同Answer: FalseExplanation:Sleep spindles and K-complexes are characteristic of stage 2 sleep, not stage 1. Stage 1 is a lighter sleep stage, while stage 2 sleep is marked by these distinctive patterns in the EEG. 点赞

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Question at position 2 Sleep spindles and K-complexes are often associated with stage 1 sleep.Sleep spindles and K-complexes are often associated with stage 1 sleep.TrueFalse题目解析X解答完成正在帮您自动填写... 自动填写将优先使用云端题库答案可能与解析结果有所不同Answer: FalseExplanation:Sleep spindles and K-complexes are characteristic of stage 2 sleep, not stage 1. Stage 1 is a lighter sleep stage, while stage 2 sleep is marked by these distinctive patterns in the EEG. 点赞

BlackTom AI · Accepted Answer

Question restatement: The statement to evaluate is whether sleep spindles and K-complexes are often associated with stage 1 sleep. Answer options: True or False.

Option 1: True. This claim says that sleep spindles and K-complexes occur in stage 1 sleep. In sleep physiology, however, stage 1 is a light transitional sleep with low-amplitude, mixed-frequency EEG activity and relatively few defining features. Sleep spindles and K-complexes are not characteristic of stage 1, so this option mislabels the classic EEG markers.

Option 2: False. This option asserts that sleep spindles and K-complexes are not typically linked to stage 1 sleep. In fact, these features are hallmark indicators of stage 2 sleep, where sleep spindles (brief bursts of 12–16 Hz activity) and K-complexes (single large negative deflections followed by a positive deflection) commonly appear. This makes stage 2 the more accurate association for these patterns.

Why the incorrect option fails: Choosing True would reflect a misunderstanding of sleep stage EEG signatures, mixing up the characteristic patterns with an earlier lighter stage. The presence of spindles and K-complexes is not observed as a defining feature of stage 1, so the statement is not supported by standard sleep staging criteria.

Why the correct option is appropriate: Selecting False aligns with the well-established framework of sleep architecture, where stage 2 is distinguished by the appearance of sleep spindles and K-complexes, marking a deeper level of non-REM sleep than stage 1. This understanding helps in correctly interpreting EEG readouts during sleep studies.

If you’re reviewing for exams, remember: stage 1 = light sleep with theta activity and some slowing; stage 2 = presence of sleep spindles and K-complexes; stage 3/slow-wave sleep involve delta waves. Misplacing these features leads to errors in sleep stage identification.

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