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Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams

This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events and memories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurred in waking life, or, more often, they can be part...

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Autores principales: Blagrove, Mark, Fouquet, Nathalie C., Henley-Einion, Josephine A., Pace-Schott, Edward F., Davies, Anna C., Neuschaffer, Jennifer L., Turnbull, Oliver H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3202556/
https://www.ncbi.nlm.nih.gov/pubmed/22046336
http://dx.doi.org/10.1371/journal.pone.0026708
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author Blagrove, Mark
Fouquet, Nathalie C.
Henley-Einion, Josephine A.
Pace-Schott, Edward F.
Davies, Anna C.
Neuschaffer, Jennifer L.
Turnbull, Oliver H.
author_facet Blagrove, Mark
Fouquet, Nathalie C.
Henley-Einion, Josephine A.
Pace-Schott, Edward F.
Davies, Anna C.
Neuschaffer, Jennifer L.
Turnbull, Oliver H.
author_sort Blagrove, Mark
collection PubMed
description This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events and memories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurred in waking life, or, more often, they can be partial or indirect. Two types of temporal relationship have been found to characterize the time of occurrence of a daytime event and the reappearance or incorporation of its features in a dream. These temporal relationships are referred to as the day-residue or immediate incorporation effect, where there is the reappearance of features from events occurring on the immediately preceding day, and the dream-lag effect, where there is the reappearance of features from events occurring 5–7 days prior to the dream. Previous work on the dream-lag effect has used spontaneous home recalled dream reports, which can be from Rapid Eye Movement Sleep (REM) and from non-Rapid Eye Movement Sleep (NREM). This study addresses whether the dream-lag effect occurs only for REM sleep dreams, or for both REM and NREM stage 2 (N2) dreams. 20 participants kept a daily diary for over a week before sleeping in the sleep laboratory for 2 nights. REM and N2 dreams collected in the laboratory were transcribed and each participant rated the level of correspondence between every dream report and every diary record. The dream-lag effect was found for REM but not N2 dreams. Further analysis indicated that this result was not due to N2 dream reports being shorter, in terms of number of words, than the REM dream reports. These results provide evidence for a 7-day sleep-dependent non-linear memory consolidation process that is specific to REM sleep, and accord with proposals for the importance of REM sleep to emotional memory consolidation.
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spelling pubmed-32025562011-11-01 Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams Blagrove, Mark Fouquet, Nathalie C. Henley-Einion, Josephine A. Pace-Schott, Edward F. Davies, Anna C. Neuschaffer, Jennifer L. Turnbull, Oliver H. PLoS One Research Article This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events and memories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurred in waking life, or, more often, they can be partial or indirect. Two types of temporal relationship have been found to characterize the time of occurrence of a daytime event and the reappearance or incorporation of its features in a dream. These temporal relationships are referred to as the day-residue or immediate incorporation effect, where there is the reappearance of features from events occurring on the immediately preceding day, and the dream-lag effect, where there is the reappearance of features from events occurring 5–7 days prior to the dream. Previous work on the dream-lag effect has used spontaneous home recalled dream reports, which can be from Rapid Eye Movement Sleep (REM) and from non-Rapid Eye Movement Sleep (NREM). This study addresses whether the dream-lag effect occurs only for REM sleep dreams, or for both REM and NREM stage 2 (N2) dreams. 20 participants kept a daily diary for over a week before sleeping in the sleep laboratory for 2 nights. REM and N2 dreams collected in the laboratory were transcribed and each participant rated the level of correspondence between every dream report and every diary record. The dream-lag effect was found for REM but not N2 dreams. Further analysis indicated that this result was not due to N2 dream reports being shorter, in terms of number of words, than the REM dream reports. These results provide evidence for a 7-day sleep-dependent non-linear memory consolidation process that is specific to REM sleep, and accord with proposals for the importance of REM sleep to emotional memory consolidation. Public Library of Science 2011-10-26 /pmc/articles/PMC3202556/ /pubmed/22046336 http://dx.doi.org/10.1371/journal.pone.0026708 Text en Blagrove et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Blagrove, Mark
Fouquet, Nathalie C.
Henley-Einion, Josephine A.
Pace-Schott, Edward F.
Davies, Anna C.
Neuschaffer, Jennifer L.
Turnbull, Oliver H.
Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title_full Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title_fullStr Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title_full_unstemmed Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title_short Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
title_sort assessing the dream-lag effect for rem and nrem stage 2 dreams
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3202556/
https://www.ncbi.nlm.nih.gov/pubmed/22046336
http://dx.doi.org/10.1371/journal.pone.0026708
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