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

Mark Blagrove Orcid Logo, Nathalie C Fouquet, Josephine A Henley-Einion, Edward F Pace-Schott, Anna C Davies, Jennifer L Neuschaffer, Oliver H Turnbull

PLoS ONE, Volume: 6, Issue: 10, Start page: e26708

Swansea University Author: Mark Blagrove Orcid Logo

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DOI (Published version): 10.1371/journal.pone.0026708

Abstract

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

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Published in: PLoS ONE
ISSN: 1932-6203
Published: San Francisco PLoS 2011
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URI: https://cronfa.swan.ac.uk/Record/cronfa9315
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spelling 2019-06-13T15:38:38.1663107 v2 9315 2012-03-19 Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams 8c78ee008e650b9f0a463bae56a5636c 0000-0002-9854-1854 Mark Blagrove Mark Blagrove true false 2012-03-19 HPS This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events andmemories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurredin waking life, or, more often, they can be partial or indirect. Two types of temporal relationship have been found tocharacterize the time of occurrence of a daytime event and the reappearance or incorporation of its features in a dream. Thesetemporal relationships are referred to as the day-residue or immediate incorporation effect, where there is the reappearance offeatures from events occurring on the immediately preceding day, and the dream-lag effect, where there is the reappearanceof features from events occurring 5–7 days prior to the dream. Previous work on the dream-lag effect has used spontaneoushome 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 stage2 (N2) dreams. 20 participants kept a daily diary for over a week before sleeping in the sleep laboratory for 2 nights. REM andN2 dreams collected in the laboratory were transcribed and each participant rated the level of correspondence between everydream report and every diary record. The dream-lag effect was found for REM but not N2 dreams. Further analysis indicatedthat 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 REMsleep, and accord with proposals for the importance of REM sleep to emotional memory consolidation. Journal Article PLoS ONE 6 10 e26708 PLoS San Francisco 1932-6203 sleep; dream; memory; learning; REM sleep 26 10 2011 2011-10-26 10.1371/journal.pone.0026708 www.plosone.org . COLLEGE NANME Psychology COLLEGE CODE HPS Swansea University 2019-06-13T15:38:38.1663107 2012-03-19T15:27:09.6258336 Faculty of Medicine, Health and Life Sciences School of Psychology Mark Blagrove 0000-0002-9854-1854 1 Nathalie C Fouquet 2 Josephine A Henley-Einion 3 Edward F Pace-Schott 4 Anna C Davies 5 Jennifer L Neuschaffer 6 Oliver H Turnbull 7 0009315-21012013135152.pdf Blagrove,__Fouquet__et__al__2011.pdf 2013-01-21T13:51:52.6230000 Output 273410 Version of Record true 2012-01-21T00:00:00.0000000 true
title Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
spellingShingle Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
Mark Blagrove
title_short 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_sort Assessing the Dream-Lag Effect for REM and NREM Stage 2 Dreams
author_id_str_mv 8c78ee008e650b9f0a463bae56a5636c
author_id_fullname_str_mv 8c78ee008e650b9f0a463bae56a5636c_***_Mark Blagrove
author Mark Blagrove
author2 Mark Blagrove
Nathalie C Fouquet
Josephine A Henley-Einion
Edward F Pace-Schott
Anna C Davies
Jennifer L Neuschaffer
Oliver H Turnbull
format Journal article
container_title PLoS ONE
container_volume 6
container_issue 10
container_start_page e26708
publishDate 2011
institution Swansea University
issn 1932-6203
doi_str_mv 10.1371/journal.pone.0026708
publisher PLoS
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str School of Psychology{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}School of Psychology
url www.plosone.org
document_store_str 1
active_str 0
description This study investigates evidence, from dream reports, for memory consolidation during sleep. It is well-known that events andmemories from waking life can be incorporated into dreams. These incorporations can be a literal replication of what occurredin waking life, or, more often, they can be partial or indirect. Two types of temporal relationship have been found tocharacterize the time of occurrence of a daytime event and the reappearance or incorporation of its features in a dream. Thesetemporal relationships are referred to as the day-residue or immediate incorporation effect, where there is the reappearance offeatures from events occurring on the immediately preceding day, and the dream-lag effect, where there is the reappearanceof features from events occurring 5–7 days prior to the dream. Previous work on the dream-lag effect has used spontaneoushome 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 stage2 (N2) dreams. 20 participants kept a daily diary for over a week before sleeping in the sleep laboratory for 2 nights. REM andN2 dreams collected in the laboratory were transcribed and each participant rated the level of correspondence between everydream report and every diary record. The dream-lag effect was found for REM but not N2 dreams. Further analysis indicatedthat 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 REMsleep, and accord with proposals for the importance of REM sleep to emotional memory consolidation.
published_date 2011-10-26T03:11:14Z
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