Deep sleep divides the cortex into opposite modes of anatomical–functional coupling
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The coupling of anatomical and functional connectivity at rest suggests that anatomy is essential for wake-typical activity patterns. Here, we study the development of this coupling from wakefulness to deep sleep. Globally, similarity between whole-brain anatomical and functional connectivity networks increased during deep sleep. Regionally, we found differential coupling: during sleep, functional connectivity of primary cortices resembled more the underlying anatomical connectivity, while we observed the opposite in associative cortices. Increased anatomical–functional similarity in sensory areas is consistent with their stereotypical, cross-modal response to the environment during sleep. In distinction, looser coupling—relative to wakeful rest—in higher order integrative cortices suggests that sleep actively disrupts default patterns of functional connectivity in regions essential for the conscious access of information and that anatomical connectivity acts as an anchor for the restoration of their functionality upon awakening.
KeywordsSleep Consciousness Anatomical connectivity Functional connectivity
This work was supported by the Bundesministerium für Bildung und Forschung (grant number 01 EV 0703) and the LOEWE Neuronale Koordination Forschungsschwerpunkt Frankfurt (NeFF). We are indebted to Helmuth Steinmetz and Günther Deuschl for their patronage; Astrid Morzelewski for data acquisition and sleep scoring together with Kolja Jahnke; Sandra Anti, Ralf Deichmann and Steffen Volz for extensive MRI support; Thomas Sattler for excellent IT infrastructure maintenance; and our volunteers for participation in the study. We thank an anonymous reviewer and Olaf Sporns for most constructive comments on this manuscript.
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