Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling

Jonas Beck,1 Maren Jasmin Cordi,1,2 Björn Rasch1,2 1Department of Psychology, University of Fribourg, Fribourg, Switzerland; 2Center of Competence Sleep & Health Zurich, University of Zurich, Zurich, SwitzerlandCorrespondence: Björn RaschDivision of Cognitive Biopsychology and Methods, Departmen...

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Autores principales:	Beck J, Cordi MJ, Rasch B
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2021
Materias:	memory consolidation learning sws co-occurrence slow-oscillation hypnosis Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
Acceso en línea:	https://doaj.org/article/32d757785c6f4a7c8a6917719b5bc280
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spelling	oai:doaj.org-article:32d757785c6f4a7c8a6917719b5bc2802021-12-02T14:51:50ZHypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling1179-1608https://doaj.org/article/32d757785c6f4a7c8a6917719b5bc2802021-08-01T00:00:00Zhttps://www.dovepress.com/hypnotic-suggestions-increase-slow-wave-parameters-but-decrease-slow-w-peer-reviewed-fulltext-article-NSShttps://doaj.org/toc/1179-1608Jonas Beck,1 Maren Jasmin Cordi,1,2 Björn Rasch1,2 1Department of Psychology, University of Fribourg, Fribourg, Switzerland; 2Center of Competence Sleep & Health Zurich, University of Zurich, Zurich, SwitzerlandCorrespondence: Björn RaschDivision of Cognitive Biopsychology and Methods, Department of Psychology, University of Fribourg, Rue P.-A-de-Faucigny 2, Fribourg, CH-1700, SwitzerlandTel +41 26 300 7637Email bjoern.rasch@unifr.chPurpose: Sleep, in particular slow-wave sleep, is beneficial for memory consolidation. In two recent studies, a hypnotic suggestion to sleep more deeply increased the amount of slow-wave sleep in both a nap and a night design. In spite of these increases in slow-wave sleep, no beneficial effect on declarative memory consolidation was found. As coupling of slow-waves and sleep spindles is assumed to be critical for declarative memory consolidation during sleep, we hypothesized that the missing memory benefit after increased SWS could be related to a decrease in slow-wave/spindle coupling.Participants and Methods: Data from 33 highly hypnotizable subjects were retrieved from a nap (n = 14) and a night (n = 19) study with a similar design and procedure. After an adaptation session, subjects slept in the sleep laboratory for two experimental sessions with polysomnography. Prior to sleep, a paired-associate learning task was conducted. Next, subjects either listened to a hypnotic suggestion to sleep more deeply or to a control text in a randomized order according to a within-subject design. After sleep, subjects performed the recall of the memory task. Here, we conducted a fine-grained analysis of the sleep data on slow-waves, spindles and their coupling.Results: In line with our hypothesis, listening to a hypnosis tape decreased the percentage of spindles coupled to slow-waves. Slow-wave parameters were consistently increased, but sleep spindles remained unaffected by the hypnotic suggestion.Conclusion: Our results suggest that selectively enhancing slow-waves without affecting sleep spindles might not be sufficient to improve memory consolidation during sleep.Keywords: memory consolidation, learning, SWS, co-occurrence, slow-oscillation, hypnosisBeck JCordi MJRasch BDove Medical Pressarticlememory consolidationlearningswsco-occurrenceslow-oscillationhypnosisPsychiatryRC435-571Neurophysiology and neuropsychologyQP351-495ENNature and Science of Sleep, Vol Volume 13, Pp 1383-1393 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	memory consolidation learning sws co-occurrence slow-oscillation hypnosis Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
spellingShingle	memory consolidation learning sws co-occurrence slow-oscillation hypnosis Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495 Beck J Cordi MJ Rasch B Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
description	Jonas Beck,1 Maren Jasmin Cordi,1,2 Björn Rasch1,2 1Department of Psychology, University of Fribourg, Fribourg, Switzerland; 2Center of Competence Sleep & Health Zurich, University of Zurich, Zurich, SwitzerlandCorrespondence: Björn RaschDivision of Cognitive Biopsychology and Methods, Department of Psychology, University of Fribourg, Rue P.-A-de-Faucigny 2, Fribourg, CH-1700, SwitzerlandTel +41 26 300 7637Email bjoern.rasch@unifr.chPurpose: Sleep, in particular slow-wave sleep, is beneficial for memory consolidation. In two recent studies, a hypnotic suggestion to sleep more deeply increased the amount of slow-wave sleep in both a nap and a night design. In spite of these increases in slow-wave sleep, no beneficial effect on declarative memory consolidation was found. As coupling of slow-waves and sleep spindles is assumed to be critical for declarative memory consolidation during sleep, we hypothesized that the missing memory benefit after increased SWS could be related to a decrease in slow-wave/spindle coupling.Participants and Methods: Data from 33 highly hypnotizable subjects were retrieved from a nap (n = 14) and a night (n = 19) study with a similar design and procedure. After an adaptation session, subjects slept in the sleep laboratory for two experimental sessions with polysomnography. Prior to sleep, a paired-associate learning task was conducted. Next, subjects either listened to a hypnotic suggestion to sleep more deeply or to a control text in a randomized order according to a within-subject design. After sleep, subjects performed the recall of the memory task. Here, we conducted a fine-grained analysis of the sleep data on slow-waves, spindles and their coupling.Results: In line with our hypothesis, listening to a hypnosis tape decreased the percentage of spindles coupled to slow-waves. Slow-wave parameters were consistently increased, but sleep spindles remained unaffected by the hypnotic suggestion.Conclusion: Our results suggest that selectively enhancing slow-waves without affecting sleep spindles might not be sufficient to improve memory consolidation during sleep.Keywords: memory consolidation, learning, SWS, co-occurrence, slow-oscillation, hypnosis
format	article
author	Beck J Cordi MJ Rasch B
author_facet	Beck J Cordi MJ Rasch B
author_sort	Beck J
title	Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
title_short	Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
title_full	Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
title_fullStr	Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
title_full_unstemmed	Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling
title_sort	hypnotic suggestions increase slow-wave parameters but decrease slow-wave spindle coupling
publisher	Dove Medical Press
publishDate	2021
url	https://doaj.org/article/32d757785c6f4a7c8a6917719b5bc280
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_version_	1718389439001001984

Hypnotic Suggestions Increase Slow-Wave Parameters but Decrease Slow-Wave Spindle Coupling

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