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The Journal of Neuroscience, August 4, 2004, 24(31):6862-6870; doi:10.1523/JNEUROSCI.1318-04.2004
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Behavioral/Systems/Cognitive
The Sleep Slow Oscillation as a Traveling Wave
Marcello Massimini,
Reto Huber,
Fabio Ferrarelli,
Sean Hill, and
Giulio Tononi
Department of Psychiatry, University of Wisconsin-Madison, Madison, Wisconsin 53719
During much of sleep, virtually all cortical neurons undergo a slow oscillation (<1 Hz) in membrane potential, cycling from a hyperpolarized state of silence to a depolarized state of intense firing. This slow oscillation is the fundamental cellular phenomenon that organizes other sleep rhythms such as spindles and slow waves. Using high-density electroencephalogram recordings in humans, we show here that each cycle of the slow oscillation is a traveling wave. Each wave originates at a definite site and travels over the scalp at an estimated speed of 1.2-7.0 m/sec. Waves originate more frequently in prefrontal-orbitofrontal regions and propagate in an anteroposterior direction. Their rate of occurrence increases progressively reaching almost once per second as sleep deepens. The pattern of origin and propagation of sleep slow oscillations is reproducible across nights and subjects and provides a blueprint of cortical excitability and connectivity. The orderly propagation of correlated activity along connected pathways may play a role in spike timing-dependent synaptic plasticity during sleep.
Key words: sleep; slow oscillation; human; EEG; cortex; spontaneous activity
Received April 7, 2004;
revised June 3, 2004;
accepted June 17, 2004.
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