K complexes can be defined by which of the following characteristics?

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K complexes are distinctive patterns observed in electroencephalograms (EEGs) that are characterized by sharp waves followed by a slow wave component. These complexes typically arise in response to environmental stimuli, such as sounds, and are more pronounced during sleep stages, particularly NREM sleep. The presence of a sharp slow wave preceding the K complex is a key identifier; thus, they are often triggered by external stimuli.

The nature of K complexes highlights their role in sleep and responsiveness to the environment. When a sound is detected, the brain may generate a K complex in reaction, which serves as a protective mechanism that helps the sleeper maintain sleep despite disturbances. This characteristic of being elicited by sound truly defines K complexes and distinguishes them from other EEG patterns.

In summary, B accurately captures the defining features of K complexes by linking their occurrence to external stimulation, underscoring the role these brain waves play as a response mechanism during sleep.

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