During this stage of sleep, the brain is no longer responding to environmental sensory cues, and neurons in the neocortex and thalamus fire in synchrony because of decreased activation from the activating brainstem areas.

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Quizplus · Accepted Answer

This description matches slow-wave sleep, which is characterized by synchronized neuronal firing in the neocortex and thalamus due to reduced input from the brainstem. This stage is also known for a lack of responsiveness to environmental stimuli.

During This Stage of Sleep, the Brain Is No Longer