Based on the scenario provided, identify the specific brain wave pattern observed on the EEG and explain its probable dual function in this context.

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A K-complex is a very high-amplitude pattern of brain activity observed on an EEG during Stage 2 of NREM sleep, visually distinguished by its significantly high amplitude and longer wavelength. It can occur as a reaction to environmental stimuli and is thought to serve as a bridge to higher levels of arousal. K-complexes are also involved in sleep maintenance and memory consolidation.

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