PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -The K-Complex is a waveform identified on electroencephalography (EEG), which primarily occurs during Stage 2 (N2) of NREM sleep, along with sleep spindles, which make up the two distinct features seen in this stage.

Detailed explanation-2: -Stage 2 (N2) is characterized by the presence of bilaterally synchronous theta activity accompanied by sleep spindles or K-complexes, or both.

Detailed explanation-3: -In the deepest level of sleep, stage IV sleep, the predominant EEG activity consists of low frequency (1–4 Hz), high-amplitude fluctuations called delta waves, the characteristic slow waves for which this phase of sleep is named. The entire sequence from drowsiness to deep stage IV sleep usually takes about an hour.

Detailed explanation-4: -Sleep spindles and K-complexes are features specific to non-REM sleep that may be related to sleep homeostasis and memory consolidation. The full extent of brain regions active during their occurrences is not known.

Detailed explanation-5: -Stage 3 of sleep is often referred to as deep sleep or slow-wave sleep because these stages are characterized by low frequency (less than 3 Hz), high amplitude delta waves (Figure 4). During this time, an individual’s heart rate and respiration slow dramatically.