21 papers · ranked by Valyu relevance
B. Alexander Diaz, Sophie Van Der Sluis, Sarah Moens, Jeroen S. Benjamins + 11 more
'Jeroen S. Benjamins' 'Filippo Migliorati' 'Diederick Stoffers' 'Anouk Den Braber' 'Simon-Shlomo Poil' 'Richard Hardstone' "Dennis Van't Ent" 'Dorret I. Boomsma' 'Eco De Geus' 'Huibert D. Mansvelder' 'Eus J. W. Van Someren' 'Klaus Linkenkaer-Hansen'] Resting-state neuroimaging is a dominant paradigm for studying brain…
Marc Joliot, Sandrine Cremona, Christophe Tzourio, Olivier Etard
This research explores the effects of drowsiness on variability in functional connectivity (FC) during resting-state functional magnetic resonance imaging. The study utilized a cohort of students (MRi-Share) and classified individuals into drowsy (N=68), alert (N=96), and mixed/undetermined states based on observed…
H. Honcamp, M. Schwartze, M. Amorim, D.E.J. Linden + 2 more
Resting state (RS) brain activity is inherently non-stationary. Hidden Semi-Markov Models (HsMM) can characterize the continuous RS data as a sequence of recurring and distinct brain states along with their spatio-temporal dynamics. Recent explorations suggest that EEG brain state dynamics in the alpha frequency link…
Xiaoyu Zhou, Luiz Pessoa
Functional MRI in the absence of tasks reveals dynamic large-scale configurations. Yet important gaps in our understanding remain: (1) What type of dynamics are observed during brain states? (2) What type of dynamics are observed between brain states? We address these questions by developing a multi-level Switching…
Jaime Gómez-Ramírez, Shelagh Freedman, Diego Mateos, José Luis Pérez-Velázquez + 1 more
This paper addresses a fundamental question, are eyes closed and eyes open resting states equivalent baseline conditions, or do they have consistently different electrophysiological signatures? We compare the functional connectivity patterns in an eyes closed resting state with an eyes open resting state, and show that…
Felipe Aedo-Jury, Miriam Schwalm, Lara Hamzehpour, Albrecht Stroh
Previously, using simultaneous task-free fMRI and optic-fiber-based neuronal calcium recordings in the anesthetized rat, we identified BOLD responses directly related to slow calcium waves, revealing a cortex-wide and spatially organized BOLD correlate (11). Here, with these bimodal recordings, we reveal two distinct…
Maryam Falahpour, Catie Chang, Chi Wah Wong, Thomas T. Liu
Changes in vigilance or alertness during a typical resting state fMRI scan are inevitable and have been found to affect measures of functional brain connectivity. Since it is not often feasible to monitor vigilance with EEG during fMRI scans, it would be of great value to have methods for estimating vigilance levels…
Mahdieh Ghasemi, Sadjaad Ozgoli, Ali Motie Nasrabadi
Brain-computer interface (BCI) systems are usually designed specifically for each subject based on motor imagery. Therefore, the usability of these networks has become a significant challenge. The network has to be designed separately for each user, which is time-consuming for the user. Therefore, this study proposes a…
Joseph Bodenheimer, Paul Bogdan, Sérgio Pequito, Arian Ashourvan
Understanding the neural mechanisms underlying the transitions between different states of consciousness is a fundamental challenge in neuroscience. Thus, we investigate the underlying drivers of changes during the resting-state dynamics of the human brain, as captured by functional magnetic resonance imaging (fMRI)…
Ivan Igor Gaez, Elpidio Attoh-Mensah, Clément Nathou, Lydie Vincent + 4 more
'Marc Joliot' 'Luc Brun' 'Mikaël Naveau' 'Olivier Etard'] Title: Summary The present use of ocular activity to enhance the temporal resolution of the classification of sleep onset period (SOP) allowed to reveal an increase in the power of oscillations in the BOLD signal at 0.05 Hz in the brain, particularly in sensory…
James B. Wilsenach, Catherine E. Warnaby, Charlotte M. Deane, Gesine Reinert
'Gesine Reinert'] As a relatively new field, network neuroscience has tended to focus on aggregate behaviours of the brain averaged over many successive experiments or over long recordings in order to construct robust brain models. These models are limited in their ability to explain dynamic state changes in the brain…
Gregory Anderson, Raghu Nath Behera, Ravi V. Gomatam
Earlier QM/MM studies of the resting state of vanadium chloroperoxidase (VCPO) focused on the diprotonated states of the vanadate cofactor. Herein, we report a new extensive QM/MM study that includes the tri- and quadprotonated states of VCPO at neutral pH. We identify certain di- and triprotonated states as being…
Lucie Bréchet, Christoph M. Michel
Conscious experiences unify distinct phenomenological experiences that seem to be continuously evolving. Yet, empirical evidence shows that conscious mental activity is discontinuous and can be parsed into a series of states of thoughts that manifest as discrete spatiotemporal patterns of global neuronal activity…
Yishul Wei, Jennifer R. Ramautar, Michele A. Colombo, Bart H. W. te Lindert + 1 more
'Bart H. W. te Lindert' 'Eus J. W. Van Someren'] People with Insomnia Disorder (ID) not only experience abundant nocturnal mentation, but also report altered spontaneous mental content during daytime wakefulness, such as an increase in bodily experiences (heightened somatic awareness). Previous studies have shown that…
Richard McCloskey, Matthew H. Goodman, Sara McHugh Grant, Arpita Ghorai + 2 more
Sleep is a heterogeneous behavioral state comprised of different stages and interspersed with episodes of wakefulness. Sleep/wake states can be monitored in the sleep laboratory by polysomnography (PSG). However, sleep studies are intrusive, laborious and expensive, and are usually performed over a single night. In…
Glenn J M van der Lande, Diana Casas-Torremocha, Arnau Manasanch, Leonardo Dalla Porta + 16 more
Experimental and clinical studies of consciousness identify brain states (i.e. quasi-stable functional cerebral organization) in a non-systematic manner and largely independent of the research into brain state modulation. In this narrative review, we synthesize advances in the identification of brain states associated…
Kweon, Young-Seok, Shin, Gi-Hwan + 6 more
Conscious state estimation is important in various medical settings, including sleep staging and anesthesia management, to ensure patient safety and optimize health outcomes. Traditional methods predominantly utilize electroencephalography (EEG), which faces challenges such as high sensitivity to noise and the…
Sarah Steghaus, Christian H. Poth, Michael B. Steinborn
Human well-being and functioning depend on two fundamental mental states: Relaxation and sleepiness. Relaxation and sleepiness are both assumed to be states of low physiological arousal and negatively correlated. However, it is still unclear how consistent this negative relationship is across different settings and…
Rebecca Robbins, Stuart F. Quan, Daniel J. Buysse, Matthew D. Weaver + 7 more
Restorative sleep is a commonly used term but a poorly defined construct. Few studies have assessed restorative sleep in nationally representative samples. We convened a panel of 7 expert physicians and researchers to evaluate and enhance available measures of restorative sleep. We then developed the revised…
Alexander Poltorak
Insomnia disorder is defined at the syndrome level, yet similar complaints can arise from different abnormalities in sleep regulation, state transition, state stabilization, spatial recruitment, architectural sequencing, and state perception. We propose a multiaxial dynamical framework whose principal contribution is…
Jasleen Gund, Yashaswee Mishra, Rohit K. Singh, B.N. Mallick
The cognitive states have broadly been divided into waking, rapid eye movement sleep (REMS) and non-REMS (NREMS). Although the mechanism of state transition is unknown, it has been proposed that functional activation/deactivation among different brain regions leads to such transition. As analysis of…