Sleeping brain

Oscillations in the EEG of between 0.5 and 4 Hz, sometimes also called delta activity. SWA is a hallmark of the sleeping brain, and is most prevalent in the deepest sleep stages (stages 3 4). The slow oscillations arise from widespread synchrony of neuronal firing, particularly in the thalamocortical circuits. 

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Office of Communications and Public Liaison, National Institute of Neurological Disorders and Stroke. Brain Basics Understanding Sleep. National Institute of Neurological Disorders and Stroke. Available online at http //www.ninds.nih.gov/disorders/brain basics/understanding sleep brain basic.htm. 

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Mental states, such as waking and dreaming, are as many f splendoured in their details as are the waking and sleeping brain. 

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