During sleep, what causes the increased amplitude of slow waves measured by EEG in the cerebral cortex as sleep pressure increases?

💡 Explanation

Enhanced synaptic depression during sleep reduces synaptic strength, resulting in synchronized neuronal firing and increased slow-wave amplitude on EEG, because homeostatic synaptic downscaling occurs. Therefore, B is correct, rather than A, C, or D, which would result in increased cortical excitation.

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