Sleep has been shown to subtly disrupt the spatial organization of functional connectivity networks in the brain, but in a way that largely preserves the connectivity within sensory cortices. Here we evaluated the hypothesis that sleep does impact sensory cortices, but through alteration of activity dynamics. We therefore examined the impact of sleep on hemodynamics using a method for quantifying non-random, high frequency signatures of the blood-oxygen-level dependent (BOLD) signal (amplitude variance asymmetry; AVA). We found that sleep was associated with the elimination of these dynamics in a manner that is restricted to auditory, motor and visual cortices. This elimination was concurrent with increased variance of activity in these regions. Functional connectivity between regions showing AVA during wakefulness maintained a relatively consistent hierarchical structure during wakefulness and N1 and N2 sleep, despite a gradual reduction of connectivity strength as sleep progressed. Thus, sleep is related to elimination of high frequency non-random activity signatures in sensory cortices that are robust during wakefulness. The elimination of these AVA signatures conjointly with preservation of the structure of functional connectivity patterns may be linked to the need to suppress sensory inputs during sleep while still maintaining the capacity to react quickly to complex multimodal inputs.

Progression to deep sleep is characterized by changes to BOLD dynamics in sensory cortices / Davis, James Benjamin; Tagliazucchi, Enzo; Jovicich, Jorge; Laufs, Helmut; Hasson, Uri. - In: NEUROIMAGE. - ISSN 1053-8119. - 130 (2016):(2016), pp. 293-305. [10.1016/j.neuroimage.2015.12.034]

Progression to deep sleep is characterized by changes to BOLD dynamics in sensory cortices

Davis, James Benjamin;Jovicich, Jorge;Hasson, Uri
2016

Abstract

Sleep has been shown to subtly disrupt the spatial organization of functional connectivity networks in the brain, but in a way that largely preserves the connectivity within sensory cortices. Here we evaluated the hypothesis that sleep does impact sensory cortices, but through alteration of activity dynamics. We therefore examined the impact of sleep on hemodynamics using a method for quantifying non-random, high frequency signatures of the blood-oxygen-level dependent (BOLD) signal (amplitude variance asymmetry; AVA). We found that sleep was associated with the elimination of these dynamics in a manner that is restricted to auditory, motor and visual cortices. This elimination was concurrent with increased variance of activity in these regions. Functional connectivity between regions showing AVA during wakefulness maintained a relatively consistent hierarchical structure during wakefulness and N1 and N2 sleep, despite a gradual reduction of connectivity strength as sleep progressed. Thus, sleep is related to elimination of high frequency non-random activity signatures in sensory cortices that are robust during wakefulness. The elimination of these AVA signatures conjointly with preservation of the structure of functional connectivity patterns may be linked to the need to suppress sensory inputs during sleep while still maintaining the capacity to react quickly to complex multimodal inputs.
Davis, James Benjamin; Tagliazucchi, Enzo; Jovicich, Jorge; Laufs, Helmut; Hasson, Uri
Progression to deep sleep is characterized by changes to BOLD dynamics in sensory cortices / Davis, James Benjamin; Tagliazucchi, Enzo; Jovicich, Jorge; Laufs, Helmut; Hasson, Uri. - In: NEUROIMAGE. - ISSN 1053-8119. - 130 (2016):(2016), pp. 293-305. [10.1016/j.neuroimage.2015.12.034]
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S1053811915011477-main.pdf

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 3.47 MB
Formato Adobe PDF
3.47 MB Adobe PDF   Visualizza/Apri
1-s2.0-S1053811915011477-main.pdf

accesso aperto

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 2.1 MB
Formato Adobe PDF
2.1 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/134152
Citazioni
  • ???jsp.display-item.citation.pmc??? 7
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 13
social impact