Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.

<h4>Background</h4>Solving a task with insight has been associated with occipital and right-hemisphere activations. The present study tested the hypothesis if sleep-related alterations in functional activation states modulate the probability of insight into a hidden abstract regularity o...

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Autores principales:	Juliana Yordanova, Vasil Kolev, Ullrich Wagner, Rolf Verleger
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ac5116c170dc4d3d95d51e2ef43b1852
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spelling	oai:doaj.org-article:ac5116c170dc4d3d95d51e2ef43b18522021-11-25T06:25:32ZDifferential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.1932-620310.1371/journal.pone.0009442https://doaj.org/article/ac5116c170dc4d3d95d51e2ef43b18522010-02-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20195475/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Solving a task with insight has been associated with occipital and right-hemisphere activations. The present study tested the hypothesis if sleep-related alterations in functional activation states modulate the probability of insight into a hidden abstract regularity of a task.<h4>Methodology</h4>State-dependent functional activation was measured by beta and alpha electroencephalographic (EEG) activity and spatial synchronization. Task-dependent functional activation was assessed by slow cortical potentials (SPs). EEG parameters during the performance of the Number Reduction Task (NRT) were compared between before sleep and after sleep sessions. In two different groups, the relevant sleep occurred either in the first or in the second half of the night, dominated by slow wave sleep (SWS) or by rapid eye movement (REM) sleep.<h4>Principal findings</h4>Changes in EEG parameters only occurred in the early-night group, not in the late-night group and indicated occipital and right-hemisphere functional alterations. These changes were associated with off-line consolidation of implicit task representations and with the amount of SWS but they did not predict subsequent insight. The gain of insight was, however, independently associated with changes of spectral beta and alpha measures only in those subjects from the two sleep groups who would subsequently comprehend the hidden regularity of the task. Insight-related enhancement of right frontal asymmetry after sleep did not depend on sleep stages.<h4>Significance</h4>It is concluded that off-line restructuring of implicit information during sleep is accompanied by alterations of functional activation states after sleep. This mechanism is promoted by SWS but not by REM sleep and may contribute to attaining insight after sleep. Original neurophysiologic evidence is provided for alterations of the functional activation brain states after sleep. These alterations are associated with a decrease in controlled processing within the visual system and with an increase in the functional connectivity of the right hemisphere, and are supported by SWS in the first half of the night.Juliana YordanovaVasil KolevUllrich WagnerRolf VerlegerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 2, p e9442 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Juliana Yordanova Vasil Kolev Ullrich Wagner Rolf Verleger Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
description	<h4>Background</h4>Solving a task with insight has been associated with occipital and right-hemisphere activations. The present study tested the hypothesis if sleep-related alterations in functional activation states modulate the probability of insight into a hidden abstract regularity of a task.<h4>Methodology</h4>State-dependent functional activation was measured by beta and alpha electroencephalographic (EEG) activity and spatial synchronization. Task-dependent functional activation was assessed by slow cortical potentials (SPs). EEG parameters during the performance of the Number Reduction Task (NRT) were compared between before sleep and after sleep sessions. In two different groups, the relevant sleep occurred either in the first or in the second half of the night, dominated by slow wave sleep (SWS) or by rapid eye movement (REM) sleep.<h4>Principal findings</h4>Changes in EEG parameters only occurred in the early-night group, not in the late-night group and indicated occipital and right-hemisphere functional alterations. These changes were associated with off-line consolidation of implicit task representations and with the amount of SWS but they did not predict subsequent insight. The gain of insight was, however, independently associated with changes of spectral beta and alpha measures only in those subjects from the two sleep groups who would subsequently comprehend the hidden regularity of the task. Insight-related enhancement of right frontal asymmetry after sleep did not depend on sleep stages.<h4>Significance</h4>It is concluded that off-line restructuring of implicit information during sleep is accompanied by alterations of functional activation states after sleep. This mechanism is promoted by SWS but not by REM sleep and may contribute to attaining insight after sleep. Original neurophysiologic evidence is provided for alterations of the functional activation brain states after sleep. These alterations are associated with a decrease in controlled processing within the visual system and with an increase in the functional connectivity of the right hemisphere, and are supported by SWS in the first half of the night.
format	article
author	Juliana Yordanova Vasil Kolev Ullrich Wagner Rolf Verleger
author_facet	Juliana Yordanova Vasil Kolev Ullrich Wagner Rolf Verleger
author_sort	Juliana Yordanova
title	Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
title_short	Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
title_full	Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
title_fullStr	Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
title_full_unstemmed	Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
title_sort	differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/ac5116c170dc4d3d95d51e2ef43b1852
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Differential associations of early- and late-night sleep with functional brain states promoting insight to abstract task regularity.

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