[en] Falling asleep is a dynamical process that is poorly defined. The period preceding sleep, characterized by the progressive alteration of behavioral responses to the environment, which may last several minutes, has no electrophysiological definition, and is embedded in the first stage of sleep (N1). We aimed at better characterizing this drowsiness period looking for neurophysiological predictors of responsiveness using electro and magneto-encephalography. Healthy participants were recorded when falling asleep, while they were presented with continuous auditory stimulations and asked to respond to deviant sounds. We analysed brain responses to sounds and markers of ongoing activity, such as information and connectivity measures, in relation to rapid fluctuations of brain rhythms observed at sleep onset and participants' capabilities to respond. Results reveal a drowsiness period distinct from wakefulness and sleep, from alpha rhythms to the first sleep spindles, characterized by diverse and transient brain states that come on and off at the scale of a few seconds and closely reflects, mainly through neural processes in alpha and theta bands, decreasing probabilities to be responsive to external stimuli. Results also show that the global P300 was only present in responsive trials, regardless of vigilance states. A better consideration of the drowsiness period through a formalized classification and its specific brain markers such as described here should lead to significant advances in vigilance assessment in the future, in medicine and ecological environments.
Disciplines :
Radiology, nuclear medicine & imaging Neurosciences & behavior
Author, co-author :
Strauss, Mélanie; Cognitive Neuroimaging Unit, CEA DSV/I2BM, INSERM, NeuroSpin Center, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, France, Neuropsychology and Functional Imaging Research Group (UR2NF), Center for Research in Cognition and Neurosciences (CRCN), Université Libre de Bruxelles, B-1050 Brussels, Belgium, Departments of Neurology, Psychiatry and Sleep Medicine, Cliniques Universitaires de Bruxelles, Hôpital Erasme, Université Libre de Bruxelles, B-1070 Brussels, Belgium. Electronic address: melanie.strauss@erasme.ulb.ac.be
Sitt, Jacobo D; Institut du Cerveau et de la Moelle épinière, ICM, PICNIC Lab, F-75013 Paris, France, Inserm U 1127, F-75013 Paris, France
Naccache, Lionel; Institut du Cerveau et de la Moelle épinière, ICM, PICNIC Lab, F-75013 Paris, France, Department of Neurophysiology, Hôpital de la Pitié-Salpêtrière, AP-HP, F-75013 Paris, France
Raimondo, Federico ; Université de Liège - ULiège > GIGA > GIGA Consciousness - Coma Science Group
Language :
English
Title :
Predicting the loss of responsiveness when falling asleep in humans.
We are grateful to Stanislas Dehaene for his essential support in data acquisition and for helpful comments, to Bernadette Martins and the Neurospin staff for administrative support, to nurses Laurence Laurier, Véronique Joly-Testault, and Gaëlle Mediouni for their help in recruitment and data acquisition and to Kaustubh Patil for his feedback on predictive modelling. This work was supported by grants from Institut National de la Santé et de la Recherche Médicale (INSERM) and Journées de Neurologie de Langue Française (to M.S.), Stic-Amsud “RTBRAIN” (to J.D.S.) and Wallonia-Bruxelles International IN Excellence Grant (to F.R.). The Neurospin MEG facility is sponsored by grants from INSERM, CEA, Fondation pour la Recherche Médicale, the Bettencourt-Schueller Foundation, and the Région île-de-France. This study was supported by the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 945539 (HBP SGA3).We are grateful to Stanislas Dehaene for his essential support in data acquisition and for helpful comments, to Bernadette Martins and the Neurospin staff for administrative support, to nurses Laurence Laurier, V?ronique Joly-Testault, and Ga?lle Mediouni for their help in recruitment and data acquisition and to Kaustubh Patil for his feedback on predictive modelling. This work was supported by grants from Institut National de la Sant? et de la Recherche M?dicale (INSERM) and Journ?es de Neurologie de Langue Fran?aise (to M.S.), Stic-Amsud ?RTBRAIN? (to J.D.S.) and Wallonia-Bruxelles International IN Excellence Grant (to F.R.). The Neurospin MEG facility is sponsored by grants from INSERM, CEA, Fondation pour la Recherche M?dicale, the Bettencourt-Schueller Foundation, and the R?gion i?le-de-France. This study was supported by the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 945539 (HBP SGA3). M.S. made contributions to the conception of the work, study design, data acquisition, analysis and interpretation, and have drafted the manuscript. J.D.S. and L.N. made contributions to the conception of the work, study design, and revised the manuscript. F.R. made contributions to the conception of the work, data analysis and interpretation, and have drafted the manuscript.
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