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https://www.readbyqxmd.com/read/28293468/a-method-for-independent-component-graph-analysis-of-resting-state-fmri
#1
Demetrius Ribeiro de Paula, Erik Ziegler, Pubuditha M Abeyasinghe, Tushar K Das, Carlo Cavaliere, Marco Aiello, Lizette Heine, Carol di Perri, Athena Demertzi, Quentin Noirhomme, Vanessa Charland-Verville, Audrey Vanhaudenhuyse, Johan Stender, Francisco Gomez, Jean-Flory L Tshibanda, Steven Laureys, Adrian M Owen, Andrea Soddu
INTRODUCTION: Independent component analysis (ICA) has been extensively used for reducing task-free BOLD fMRI recordings into spatial maps and their associated time-courses. The spatially identified independent components can be considered as intrinsic connectivity networks (ICNs) of non-contiguous regions. To date, the spatial patterns of the networks have been analyzed with techniques developed for volumetric data. OBJECTIVE: Here, we detail a graph building technique that allows these ICNs to be analyzed with graph theory...
March 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28278590/evidence-of-altered-pressure-pain-thresholds-in-persons-with-disorders-of-consciousness-as-measured-by-the-nociception-coma-scale-italian-version
#2
Davide Sattin, Caroline Schnakers, Marco Pagani, Francesca Arenare, Guya Devalle, Fabrizio Giunco, GianBattista Guizzetti, Maurizio Lanfranchi, Ambra M Giovannetti, Venusia Covelli, Anna Bersano, Anna Nigri, Ludovico Minati, Davide Rossi Sebastiano, Eugenio Parati, MariaGrazia Bruzzone, Silvana Franceschetti, Matilde Leonardi
Pain assessment in patients with disorders of consciousness (DoC) is a controversial issue for clinicians, who require tools and standardised procedures for testing nociception in non-communicative patients. The aims of the present study were, first, to analyse the psychometric properties of the Italian version of the Nociception Coma Scale and, second, to evaluate pressure pain thresholds in a group of patients with DoC. The authors conducted a multi-centre study on 40 healthy participants and 60 DoC patients enrolled from six hospitals in Italy...
February 28, 2017: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/28266890/examination-of-the-phenomenology-of-the-ibogaine-treatment-experience-role-of-altered-states-of-consciousness-and-psychedelic-experiences
#3
Annamarie Heink, Steve Katsikas, Tiffany Lange-Altman
Psychedelic drugs have historically been used for ritualistic purposes and to help individuals gain insight. Ibogaine, a naturally occurring psychoactive substance, has been reported to have anti-addictive properties that aid in the treatment of substance use disorders. An online survey obtained retrospective data from individuals who used ibogaine in the past. Individuals who used ibogaine tended to describe thematically similar experiences post-treatment. This study adds to the literature by using the 5d-ASC, a psychometrically sound measure of altered states of consciousness (ASCs), to examine the ASCs induced by ibogaine and discusses the demographic characteristics of those who seek ibogaine treatment (N = 27)...
March 7, 2017: Journal of Psychoactive Drugs
https://www.readbyqxmd.com/read/28249943/psychedelics-and-the-science-of-self-experience
#4
EDITORIAL
Matthew M Nour, Robin L Carhart-Harris
Altered self-experiences arise in certain psychiatric conditions, and may be induced by psychoactive drugs and spiritual/religious practices. Recently, a neuroscience of self-experience has begun to crystallise, drawing upon findings from functional neuroimaging and altered states of consciousness occasioned by psychedelic drugs. This advance may be of great importance for psychiatry.
March 2017: British Journal of Psychiatry: the Journal of Mental Science
https://www.readbyqxmd.com/read/28246074/delirium-after-mechanical-ventilation-in-intensive-care-units-the-cognitive-and-psychosocial-assessment-capa-study-protocol
#5
Daniella Bulic, Michael Bennett, Helen Rodgers, Mary Nourse, Patrick Rubie, Jeffrey Cl Looi, Frank Van Haren
BACKGROUND: In the intensive care unit (ICU), critical illness delirium occurs in the context of multiple comorbidities, multi-organ failure, and invasive management techniques, such as mechanical ventilation, sedation, and lack of sleep. Delirium is characterized by an acute confusional state defined by fluctuating mental status, inattention, and either disorganized thinking or an altered level of consciousness. The long-term cognitive and psychosocial function of patients that experience delirium in the ICU is of crucial interest because preliminary data suggest a strong association between ICU-related delirium and long-term cognitive impairment...
February 28, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28245989/fmri-study-of-graduated-emotional-charge-for-detection-of-covert-activity-using-passive-listening-to-narratives
#6
Anna Sontheimer, François Vassal, Betty Jean, Fabien Feschet, Vincent Lubrano, Jean-Jacques Lemaire
Detection of awareness in patients with consciousness disorders is a challenge that can be facilitated by functional neuroimaging. We elaborated a functional magnetic resonance imaging (fMRI) protocol to detect covert in altered states of consciousness. We hypothesized that passive listening to narratives with graduated emotional charge triggers graduated cerebral activations. The fMRI protocol was designed in healthy subjects for further clinical applications. The emotional charge was graduated using voice familiarity and long-term declarative memory content: low emotional charge, unknown person telling general semantic memory; mean emotional charge, relative telling the same narratives; high emotional charge, same relative telling autobiographical memory...
February 27, 2017: Neuroscience
https://www.readbyqxmd.com/read/28167076/brain-network-alterations-in-the-inflammatory-soup-animal-model-of-migraine
#7
Lino Becerra, James Bishop, Gabi Barmettler, Vanessa Kainz, Rami Burstein, David Borsook
Advances in our understanding of the human pain experience have shifted much of the focus of pain research from the periphery to the brain. Current hypotheses suggest that the progression of migraine depends on abnormal functioning of neurons in multiple brain regions. Accordingly, we sought to capture functional brain changes induced by the application of an inflammatory cocktail known as inflammatory soup (IS), to the dura mater across multiple brain networks. Specifically, we aimed to determine whether IS alters additional neural networks indirectly related to the primary nociceptive pathways via the spinal cord to the thalamus and cortex...
April 1, 2017: Brain Research
https://www.readbyqxmd.com/read/28148581/delirium-a-guide-for-the-general-physician
#8
Oliver M Todd, Elizabeth A Teale
Delirium describes a sudden onset change in mental status of fluctuating course. This is a state of altered consciousness characterised chiefly by inattention or lack of arousal, but can also include new impairment of language, perception and behaviour. Certain predisposing factors can make an individual more susceptible to delirium in the face of a stressor. Stressors include direct insults to the brain, insults peripheral to the brain or external changes in the environment of an individual. Delirium is varied in its presentation, and can be categorised by the psychomotor profile as: hyperactive type (overly vigilant, agitated, often wandersome), hypoactive type (sedate or withdrawn) or mixed types...
February 2017: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/28147246/spinal-cord-stimulation-modulates-frontal-delta-and-gamma-in-patients-of-minimally-consciousness-state
#9
Yang Bai, Xiaoyu Xia, Xiaoli Li, Yong Wang, Yi Yang, Yangfeng Liu, Zhenhu Liang, Jianghong He
Spinal cord stimulation (SCS) has been suggested as a therapeutic technique for treating patients with disorder of consciousness (DOC). Although studies have reported its benefits for patients, the underlying pathophysiological mechanisms remain unclear. The aim of this study was to measure the effects of SCS on the EEG of patients in a minimally conscious state (MCS), which would allow us to explore the possible workings underpinning of the approach. Resting state EEG was recorded before and immediately after SCS, using various frequencies (5Hz, 20Hz, 50Hz, 70Hz and 100Hz), for 11 patients in MCS...
January 29, 2017: Neuroscience
https://www.readbyqxmd.com/read/28144933/hidden-in-plain-sight-non-convulsive-status-epilepticus-recognition-and-management
#10
REVIEW
M O Kinney, J J Craig, P W Kaplan
Non-convulsive status epilepticus (NCSE) is an electroclinical state associated with an altered level of consciousness but lacking convulsive motor activity. It can present in a multitude of ways, but classification based on the clinical presentation and electroencephalographic appearances assists in determining prognosis and planning treatment. The aggressiveness of treatment should be based on the likely prognosis and the underlying cause of the NCSE.
February 1, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28135156/dream-images-and-creation
#11
Céline Masson, Silke Schauder, Simone Korff Sausse
This article links contemporary psychoanalytic theories of the dream, especially Bion's, with the work of the American video artist Bill Viola, who is deeply influenced by altered states of consciousness and produces images of dreamlike quality. We discuss the oneiric and infantile roots of creativity and artistic inspiration, finally taking Viola's monumental artwork The Passing (1991) as paradigmatic of the artist's aesthetic and philosophical elaboration of the relationship between life and death.
February 2017: Psychoanalytic Review
https://www.readbyqxmd.com/read/28120048/recovery-from-chronic-diseases-of-consciousness-state-of-the-art-in-neuromodulation-for-persistent-vegetative-state-and-minimally-conscious-state
#12
Pier Paolo Mattogno, Giuseppe Barbagallo, Gerardo Iacopino, Gaetano Pappalardo, Giuseppe LA Rocca, Francesco Signorelli, Jun Zhong, Massimiliano Visocchi
Chronic diseases of consciousness (CDC) can still be considered a challenging frontier for modern medicine, probably because of their not completely understood physiopathological mechanisms. Following encouraging evidence on cerebral hemodynamics, some authors have hypothesized a role for neuromodulation in the treatment of CDC patients. In the past 40 years, spinal cord stimulation (SCS) and deep brain stimulation (DBS) have been used experimentally for the treatment of patients in a severe altered state of consciousness, with some interesting but not conclusive results...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28093358/mapping-the-functional-connectome-traits-of-levels-of-consciousness
#13
Enrico Amico, Daniele Marinazzo, Carol Di Perri, Lizette Heine, Jitka Annen, Charlotte Martial, Mario Dzemidzic, Murielle Kirsch, Vincent Bonhomme, Steven Laureys, Joaquín Goñi
Examining task-free functional connectivity (FC) in the human brain offers insights on how spontaneous integration and segregation of information relate to human cognition, and how this organization may be altered in different conditions, and neurological disorders. This is particularly relevant for patients in disorders of consciousness (DOC) following severe acquired brain damage and coma, one of the most devastating conditions in modern medical care. We present a novel data-driven methodology, connICA, which implements Independent Component Analysis (ICA) for the extraction of robust independent FC patterns (FC-traits) from a set of individual functional connectomes, without imposing any a priori data stratification into groups...
January 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28092321/dexmedetomidine-disrupts-the-local-and-global-efficiencies-of-large-scale-brain-networks
#14
Javeria A Hashmi, Marco L Loggia, Sheraz Khan, Lei Gao, Jieun Kim, Vitaly Napadow, Emery N Brown, Oluwaseun Akeju
BACKGROUND: A clear understanding of the neural basis of consciousness is fundamental to research in clinical and basic neuroscience disciplines and anesthesia. Recently, decreased efficiency of information integration was suggested as a core network feature of propofol-induced unconsciousness. However, it is unclear whether this finding can be generalized to dexmedetomidine, which has a different molecular target. METHODS: Dexmedetomidine was administered as a 1-μg/kg bolus over 10 min, followed by a 0...
March 2017: Anesthesiology
https://www.readbyqxmd.com/read/28074801/delirium-after-cardiac-surgery-a-pilot-study-from-a-single-tertiary-referral-center
#15
Ashok K Kumar, Aveek Jayant, V K Arya, Rohan Magoon, Ridhima Sharma
BACKGROUND: Advances in cardiac surgery has shifted paradigm of management to perioperative psychological illnesses. Delirium is a state of altered consciousness with easy distraction of thoughts. The pathophysiology of this complication is not clear, but identification of risk factors is important for positive postoperative outcomes. The goal of the present study was to prospectively identify the incidence, motoric subtypes, and risk factors associated with development of delirium in cardiac surgical patients admitted to postoperative cardiac intensive care, using a validated delirium monitoring instrument...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28025814/phenomenology-structure-and-dynamic-of-psychedelic-states
#16
Katrin H Preller, Franz X Vollenweider
Classic serotonergic hallucinogens or psychedelics produce an Altered States of Consciousness (ASC) that is characterized by profound alterations in sensory perception, mood, thought including the perception of reality, and the sense of self. Over the past years, there has been considerable progress in the search for invariant and common features of psychedelic states. In the first part of this review, we outline contemporary approaches to characterize the structure of ASCs by means of three primary etiology-independent dimensions including Oceanic Boundlessness, Anxious Ego Dissolution, and Visionary Restructuralization as well as by 11 lower order factors, all of which can be reliably measured by the Altered State of Consciousness questionnaire (APZ-OAV)...
December 27, 2016: Current Topics in Behavioral Neurosciences
https://www.readbyqxmd.com/read/28003503/parallel-recovery-of-consciousness-and-sleep-in-acute-traumatic-brain-injury
#17
Catherine Duclos, Marie Dumont, Caroline Arbour, Jean Paquet, Hélène Blais, David K Menon, Louis De Beaumont, Francis Bernard, Nadia Gosselin
OBJECTIVE: To investigate whether the progressive recuperation of consciousness was associated with the reconsolidation of sleep and wake states in hospitalized patients with acute traumatic brain injury (TBI). METHODS: This study comprised 30 hospitalized patients (age 29.1 ± 13.5 years) in the acute phase of moderate or severe TBI. Testing started 21.0 ± 13.7 days postinjury. Consciousness level and cognitive functioning were assessed daily with the Rancho Los Amigos scale of cognitive functioning (RLA)...
January 17, 2017: Neurology
https://www.readbyqxmd.com/read/27993673/propofol-attenuates-low-frequency-fluctuations-of-resting-state-fmri-bold-signal-in-the-anterior-frontal-cortex-upon-loss-of-consciousness
#18
Xiaolin Liu, Kathryn K Lauer, B Douglas Ward, Christopher Roberts, Suyan Liu, Suneeta Gollapudy, Robert Rohloff, William Gross, Guangyu Chen, Zhan Xu, Jeffrey R Binder, Shi-Jiang Li, Anthony G Hudetz
Recent studies indicate that spontaneous low-frequency fluctuations (LFFs) of resting-state functional magnetic resonance imaging (rs-fMRI) blood oxygen level-dependent (BOLD) signals are driven by the slow (<0.1Hz) modulation of ongoing neuronal activity synchronized locally and across remote brain regions. How regional LFFs of the BOLD fMRI signal are altered during anesthetic-induced alteration of consciousness is not well understood. Using rs-fMRI in 15 healthy participants, we show that during administration of propofol to achieve loss of behavioral responsiveness indexing unconsciousness, the fractional amplitude of LFF (fALFF index) was reduced in comparison to wakeful baseline in the anterior frontal regions, temporal pole, hippocampus, parahippocampal gyrus, and amygdala...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27958328/distinct-interactions-between-fronto-parietal-and-default-mode-networks-in-impaired-consciousness
#19
Jinyi Long, Qiuyou Xie, Qing Ma, M A Urbin, Liqing Liu, Ling Weng, Xiaoqi Huang, Ronghao Yu, Yuanqing Li, Ruiwang Huang
Existing evidence suggests that the default-mode network (DMN) and fronto-pariatal network (FPN) play an important role in altered states of consciousness. However, the brain mechanisms underlying impaired consciousness and the specific network interactions involved are not well understood. We studied the topological properties of brain functional networks using resting-state functional MRI data acquired from 18 patients (11 vegetative state/unresponsive wakefulness syndrome, VS/UWS, and 7 minimally conscious state, MCS) and compared these properties with those of healthy controls...
December 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27956448/delirium-a-guide-for-the-general-physician
#20
Oliver M Todd, Elizabeth A Teale
Delirium describes a sudden onset change in mental status of fluctuating course. This is a state of altered consciousness characterised chiefly by inattention or lack of arousal, but can also include new impairment of language, perception and behaviour. Certain predisposing factors can make an individual more susceptible to delirium in the face of a stressor. Stressors include direct insults to the brain, insults peripheral to the brain or external changes in the environment of an individual. Delirium is varied in its presentation, and can be categorised by the psychomotor profile as: hyperactive type (overly vigilant, agitated, often wandersome), hypoactive type (sedate or withdrawn) or mixed types...
December 2016: Clinical Medicine: Journal of the Royal College of Physicians of London
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