Article (Scientific journals)
Experience-dependent induction of hypnagogic images during daytime naps: a combined behavioural and EEG study.
Kussé, Caroline; Shaffii, Anahita; Schrouff, Jessica et al.
2011In Journal of Sleep Research
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Abstract :
[en] This study characterizes hypnagogic hallucinations reported during a polygraphically recorded 90-min daytime nap following or preceding practice of the computer game Tetris. In the experimental group (N = 16), participants played Tetris in the morning for 2 h during three consecutive days, while in a first control group (N = 13, controlling the effect of experience) participants did not play any game, and in a second control group (N = 14, controlling the effect of anticipation) participants played Tetris after the nap. During afternoon naps, participants were repetitively awakened 15, 45, 75, 120 or 180 s after the onset of S1, and were asked to report their mental content. Reports content was scored by three judges (inter-rater reliability 85%). In the experimental group, 48 out of 485 (10%) sleep-onset reports were Tetris-related. They mostly consisted of images and sounds with very little emotional content. They exactly reproduced Tetris elements or mixed them with other mnemonic components. By contrast, in the first control group, only one report out of 107 was scored as Tetris-related (1%), and in the second control group only three reports out of 112 were scored as Tetris-related (3%; between-groups comparison; P = 0.006). Hypnagogic hallucinations were more consistently induced by experience than by anticipation (P = 0.039), and they were predominantly observed during the transition of wakefulness to sleep. The observed attributes of experience-related hypnagogic hallucinations are consistent with the particular organization of regional brain activity at sleep onset, characterized by high activity in sensory cortices and in the default-mode network.
Research center :
GIGA CRC (Cyclotron Research Center) In vivo Imaging-Aging & Memory - ULiège
Disciplines :
Neurology
Author, co-author :
Kussé, Caroline ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Shaffii, Anahita ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Schrouff, Jessica ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Matarazzo, Luca 
Maquet, Pierre  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Language :
English
Title :
Experience-dependent induction of hypnagogic images during daytime naps: a combined behavioural and EEG study.
Publication date :
2011
Journal title :
Journal of Sleep Research
ISSN :
0962-1105
eISSN :
1365-2869
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FMRE - Fondation Médicale Reine Elisabeth [BE]
Commentary :
(c) 2011 European Sleep Research Society.
Available on ORBi :
since 17 October 2011

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