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• W3208236404 abstract "Sleep is indispensable for most animals' cognitive functions, and is hypothesized to be a major factor in memory consolidation. Although we do not fully understand the mechanisms of network reorganisation driving memory consolidation, available data suggests that sleep-associated neurochemical changes may be important for such processes. In particular, global acetylcholine levels change across the sleep/wake cycle, with high cholinergic tone during wake and REM sleep and low cholinergic tone during slow wave sleep. Furthermore, experimental perturbation of cholinergic tone has been shown to impact memory storage. Through in silico modeling of neuronal networks, we show how spiking dynamics change in highly heterogenous networks under varying levels of cholinergic tone, with neuronal networks under high cholinergic modulation firing asynchronously and at high frequencies, while those under low cholinergic modulation exhibit synchronous patterns of activity. We further examined the network's dynamics and its reorganization mediated via changing levels of acetylcholine within the context of different scale-free topologies, comparing network activity within the hub cells, a small group of neurons having high degree connectivity, and with the rest of the network. We show a dramatic, state-dependent change in information flow throughout the network, with highly active hub cells integrating information in a high-acetylcholine state, and transferring it to rest of the network in a low-acetylcholine state. This result is experimentally corroborated by frequency-dependent frequency changes observed in vivo experiments. Together, these findings provide insight into how new neurons are recruited into memory traces during sleep, a mechanism which may underlie system memory consolidation." @default.
• W3208236404 created "2021-11-08" @default.
• W3208236404 creator A5009654819 @default.
• W3208236404 creator A5019518085 @default.
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• W3208236404 creator A5085231340 @default.
• W3208236404 date "2021-10-25" @default.
• W3208236404 modified "2023-10-18" @default.
• W3208236404 title "Dynamical Mechanism Underlying Scale-Free Network Reorganization in Low Acetylcholine States Corresponding to Slow Wave Sleep" @default.
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• W3208236404 doi "https://doi.org/10.3389/fnetp.2021.759131" @default.
• W3208236404 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35785148" @default.
• W3208236404 hasPublicationYear "2021" @default.
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