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Eeg phase amplitude coupling

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https://www.readbyqxmd.com/read/29121278/frontal-alpha-delta-eeg-does-not-preclude-volitional-response-during-anaesthesia-prospective-cohort-study-of-the-isolated-forearm-technique
#1
A L Gaskell, D F Hight, J Winders, G Tran, A Defresne, V Bonhomme, A Raz, J W Sleigh, R D Sanders
Background: The isolated forearm test (IFT) is the gold standard test of connected consciousness (awareness of the environment) during anaesthesia. The frontal alpha-delta EEG pattern (seen in slow wave sleep) is widely held to indicate anaesthetic-induced unconsciousness. A priori we proposed that one responder with the frontal alpha-delta EEG pattern would falsify this concept. Methods: Frontal EEG was recorded in a subset of patients from three centres participating in an international multicentre study of IFT responsiveness following tracheal intubation...
October 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29097049/the-absence-of-resting-state-high-gamma-cross-frequency-coupling-in-patients-with-tinnitus
#2
Min-Hee Ahn, Sung Kwang Hong, Byoung-Kyong Min
Tinnitus is a psychoacoustic phantom perception of currently unknown neuropathology. Despite a growing number of post-stimulus tinnitus studies, uncertainty still exists regarding the neural signature of tinnitus in the resting-state brain. In the present study, we used high-gamma cross-frequency coupling and a Granger causality analysis to evaluate resting-state electroencephalographic (EEG) data in healthy participants and patients with tinnitus. Patients with tinnitus lacked robust frontal delta-phase/central high-gamma-amplitude coupling that was otherwise clearly observed in healthy participants...
October 30, 2017: Hearing Research
https://www.readbyqxmd.com/read/29079799/emergence-of-early-alterations-in-network-oscillations-and-functional-connectivity-in-a-tau-seeding-mouse-model-of-alzheimer-s-disease-pathology
#3
A Ahnaou, D Moechars, L Raeymaekers, R Biermans, N V Manyakov, A Bottelbergs, C Wintmolders, K Van Kolen, T Van De Casteele, J A Kemp, W H Drinkenburg
Synaptic dysfunction and disconnectivity are core deficits in Alzheimer's disease (AD), preceding clear changes in histopathology and cognitive functioning. Here, the early and late effects of tau pathology induction on functional network connectivity were investigated in P301L mice. Multichannel EEG oscillations were used to compute (1) coherent activity between the prefrontal cortex (PFC) and hippocampus (HPC) CA1-CA3 networks; (2) phase-amplitude cross frequency coupling (PAC) between theta and gamma oscillations, which is instrumental in adequate cognitive functioning; (3) information processing as assessed by auditory evoked potentials and oscillations in the passive oddball mismatch negativity-like (MMN) paradigm...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29067311/mnemonic-strategy-training-of-the-elderly-at-risk-for-dementia-enhances-integration-of-information-processing-via-cross-frequency-coupling
#4
Stavros I Dimitriadis, Ioannis Tarnanas, Mark Wiederhold, Brenda Wiederhold, Magda Tsolaki, Elgar Fleisch
INTRODUCTION: We sought to identify whether intensive 10-week mobile health mnemonic strategy training (MST) could shift the resting-state brain network more toward cortical-level integration, which has recently been proven to reflect the reorganization of the brain networks compensating the cognitive decline. METHODS: One hundred fifty-eight patients with mild cognitive impairment (MCI) were selected and participated in 10-week training lasting 90 min/d of memory training...
November 2016: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29060347/phase-amplitude-coupling-analysis-of-spontaneous-eeg-activity-in-alzheimer-s-disease
#5
Jesus Poza, Alejandro Bachiller, Carlos Gomez, Maria Garcia, Pablo Nunez, Javier Gomez-Pilar, Miguel A Tola-Arribas, Monica Cano, Roberto Hornero
This study was aimed at exploring phase-amplitude coupling (PAC) patterns of neural activity in dementia due to Alzheimer's disease (AD). For this task, five minutes of spontaneous electroencephalographic (EEG) activity from 22 patients with mild AD and 16 cognitively healthy controls were studied. To assess PAC patterns, phase-locking value was computed between the phase of low frequencies and the power of high frequencies within each sensor. Our results showed that high-frequency gamma power is phase-locked to the alpha peak in EEG signals...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29034902/a-robust-statistical-framework-for-instantaneous-electroencephalogram-phase-and-frequency-estimation-and-analysis
#6
Reza Sameni, Esmaeil Seraj
The instantaneous phase (IP) and instantaneous frequency (IF) of the electroencephalogram (EEG) are considered as notable complements for the EEG spectrum. The calculation of these parameters commonly includes narrow-band filtering, followed by the calculation of the signal's analytical form. The calculation of the IP and IF is highly susceptible to the filter parameters and background noise level, especially in low analytical signal amplitudes. The objective of this study is to propose a robust statistical framework for EEG IP/IF estimation and analysis...
October 16, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28901011/persistent-aberrant-cortical-phase-amplitude-coupling-following-seizure-treatment-in-absence-epilepsy-models
#7
Atul Maheshwari, Abraham Akbar, Mai Wang, Rachel Marks, Katherine Yu, Suhyeorn Park, Brett L Foster, Jeffrey L Noebels
In childhood absence epilepsy, cortical seizures are brief and intermittent; however there are extended periods without behavioural or electrographic ictal events. This genetic disorder is associated with variable degrees of cognitive dysfunction, but no consistent functional biomarkers that might provide insight into interictal cortical function have been described. Previous work in monogenic mouse models of absence epilepsy have shown that the interictal EEG displays augmented beta/gamma power in homozygous stargazer (stg/stg) mice bearing a presynaptic AMPA receptor defect, but not homozygous tottering (tg/tg) mice with a P/Q type calcium channel mutation...
September 12, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28859916/the-effect-of-type-of-afferent-feedback-timed-with-motor-imagery-on-the-induction-of-cortical-plasticity
#8
N Mrachacz-Kersting, M Voigt, Ajt Stevenson, S Aliakbaryhosseinabadi, N Jiang, K Dremstrup, D Farina
A peripherally generated afferent volley that arrives at the peak negative (PN) phase during the movement related cortical potential (MRCP) induces significant plasticity at the cortical level in healthy individuals and chronic stroke patients. Transferring this type of associative brain-computer interface (BCI) intervention into the clinical setting requires that the proprioceptive input is comparable to the techniques implemented during the rehabilitation process. These consist mainly of functional electrical stimulation (FES) and passive movement induced by an actuated orthosis...
August 28, 2017: Brain Research
https://www.readbyqxmd.com/read/28737272/dynamic-coupling-between-fmri-local-connectivity-and-interictal-eeg-in-focal-epilepsy-a-wavelet-analysis-approach
#9
Amir Omidvarnia, Mangor Pedersen, David N Vaughan, Jennifer M Walz, David F Abbott, Andrew Zalesky, Graeme D Jackson
Simultaneous scalp EEG-fMRI recording is a noninvasive neuroimaging technique for combining electrophysiological and hemodynamic aspects of brain function. Despite the time-varying nature of both measurements, their relationship is usually considered as time-invariant. The aim of this study was to detect direct associations between scalp-recorded EEG and regional changes of hemodynamic brain connectivity in focal epilepsy through a time-frequency paradigm. To do so, we developed a voxel-wise framework that analyses wavelet coherence between dynamic regional phase synchrony (DRePS, calculated from fMRI) and band amplitude fluctuation (BAF) of a target EEG electrode with dominant interictal epileptiform discharges (IEDs)...
July 24, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28610902/post-stimulus-fmri-and-eeg-responses-evidence-for-a-neuronal-origin-hypothesised-to-be-inhibitory
#10
K J Mullinger, M T Cherukara, R B Buxton, S T Francis, S D Mayhew
Post-stimulus undershoots, negative responses following cessation of stimulation, are widely observed in functional magnetic resonance (fMRI) blood oxygenation level dependent (BOLD) data. However, the debate surrounding whether the origin of this response phase is neuronal or vascular, and whether it provides functionally relevant information, that is additional to what is contained in the primary response, means that undershoots are widely overlooked. We simultaneously recorded electroencephalography (EEG), BOLD and cerebral blood-flow (CBF) [obtained from arterial spin labelled (ASL) fMRI] fMRI responses to hemifield checkerboard stimulation to test the potential neural origin of the fMRI post-stimulus undershoot...
August 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28596820/neural-synchronization-deficits-linked-to-cortical-hyper-excitability-and-auditory-hypersensitivity-in-fragile-x-syndrome
#11
Lauren E Ethridge, Stormi P White, Matthew W Mosconi, Jun Wang, Ernest V Pedapati, Craig A Erickson, Matthew J Byerly, John A Sweeney
BACKGROUND: Studies in the fmr1 KO mouse demonstrate hyper-excitability and increased high-frequency neuronal activity in sensory cortex. These abnormalities may contribute to prominent and distressing sensory hypersensitivities in patients with fragile X syndrome (FXS). The current study investigated functional properties of auditory cortex using a sensory entrainment task in FXS. METHODS: EEG recordings were obtained from 17 adolescents and adults with FXS and 17 age- and sex-matched healthy controls...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28343333/use-of-phase-locking-value-in-sensorimotor-rhythm-based-brain-computer-interface-zero-phase-coupling-and-effects-of-spatial-filters
#12
Wenjuan Jian, Minyou Chen, Dennis J McFarland
Phase-locking value (PLV) is a potentially useful feature in sensorimotor rhythm-based brain-computer interface (BCI). However, volume conduction may cause spurious zero-phase coupling between two EEG signals and it is not clear whether PLV effects are independent of spectral amplitude. Volume conduction might be reduced by spatial filtering, but it is uncertain what impact this might have on PLV. Therefore, the goal of this study was to explore whether zero-phase PLV is meaningful and how it is affected by spatial filtering...
November 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28316753/a-resting-eeg-study-of-neocortical-hyperexcitability-and-altered-functional-connectivity-in-fragile-x-syndrome
#13
Jun Wang, Lauren E Ethridge, Matthew W Mosconi, Stormi P White, Devin K Binder, Ernest V Pedapati, Craig A Erickson, Matthew J Byerly, John A Sweeney
BACKGROUND: Cortical hyperexcitability due to abnormal fast-spiking inhibitory interneuron function has been documented in fmr1 KO mice, a mouse model of the fragile X syndrome which is the most common single gene cause of autism and intellectual disability. METHODS: We collected resting state dense-array electroencephalography data from 21 fragile X syndrome (FXS) patients and 21 age-matched healthy participants. RESULTS: FXS patients exhibited greater gamma frequency band power, which was correlated with social and sensory processing difficulties...
2017: Journal of Neurodevelopmental Disorders
https://www.readbyqxmd.com/read/28269507/mining-cross-frequency-coupling-microstates-cfc%C3%AE-states-from-eeg-recordings-during-resting-state-and-mental-arithmetic-tasks
#14
Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos
The functional brain connectivity has been studied by analyzing synchronization between dynamic oscillations of identical frequency or between different frequencies of distinct brain areas. It has been hypothesized that cross-frequency coupling (CFC) between different frequency bands is the carrier mechanism for the coordination of global and local neural processes and hence supports the distributed information processing in the brain. In the present study, we attempt to study the dynamic evolution of CFC at resting-state and during a mental task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268354/phase-to-amplitude-coupling-as-a-potential-biomarker-for-creative-ideation-an-eeg-study
#15
Mina Marmpena, Stavros I Dimitriadis, Nitish Thakor, Anastasios Bezerianos
The most consistent finding of creative ideation in the neuroscientific study of creativity is the increment of EEG α power. However, the majority of existing studies focused only on ERP experimental paradigms while only a few analyzed time-related changes of EEG α power patterns during the time unlocked creation of ideas. Here, we designed an experimental paradigm where the participants were asked to generate alternative uses of everyday objects (AU task). For the control task, we adopted an Object Characteristics (OC) task, for which participants were asked to list typical characteristics or properties of an object...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28253082/multimodal-imaging-evidence-for-a-frontoparietal-modulation-of-visual-cortex-during-the-selective-processing-of-conditioned-threat
#16
Nathan M Petro, L Forest Gruss, Siyang Yin, Haiqing Huang, Vladimir Miskovic, Mingzhou Ding, Andreas Keil
Emotionally salient cues are detected more readily, remembered better, and evoke greater visual cortical responses compared with neutral stimuli. The current study used concurrent EEG-fMRI recordings to identify large-scale network interactions involved in the amplification of visual cortical activity when viewing aversively conditioned cues. To generate a continuous neural signal from pericalcarine visual cortex, we presented rhythmic (10/sec) phase-reversing gratings, the orientation of which predicted the presence (CS+) or absence (CS-) of a cutaneous electric shock (i...
June 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28227759/mining-cross-frequency-coupling-microstates-cfc%C3%AE-states-from-eeg-recordings-during-resting-state-and-mental-arithmetic-tasks
#17
Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos, Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos, Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos
The functional brain connectivity has been studied by analyzing synchronization between dynamic oscillations of identical frequency or between different frequencies of distinct brain areas. It has been hypothesized that cross-frequency coupling (CFC) between different frequency bands is the carrier mechanism for the coordination of global and local neural processes and hence supports the distributed information processing in the brain. In the present study, we attempt to study the dynamic evolution of CFC at resting-state and during a mental task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226517/phase-to-amplitude-coupling-as-a-potential-biomarker-for-creative-ideation-an-eeg-study
#18
Mina Marmpena, Stavros I Dimitriadis, Nitish Thakor, Anastasios Bezerianos, Mina Marmpena, Stavros I Dimitriadis, Nitish Thakor, Anastasios Bezerianos, Stavros I Dimitriadis, Mina Marmpena, Nitish Thakor, Anastasios Bezerianos
The most consistent finding of creative ideation in the neuroscientific study of creativity is the increment of EEG α power. However, the majority of existing studies focused only on ERP experimental paradigms while only a few analyzed time-related changes of EEG α power patterns during the time unlocked creation of ideas. Here, we designed an experimental paradigm where the participants were asked to generate alternative uses of everyday objects (AU task). For the control task, we adopted an Object Characteristics (OC) task, for which participants were asked to list typical characteristics or properties of an object...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28113303/epileptogenic-source-imaging-using-cross-frequency-coupled-signals-from-scalp-eeg
#19
Li Chunsheng, Daniel Jacobs, Trevor Hilton, Martin Del Campo, Yotin Chinvarun, Peter Carlen, Berj Bardakjian
OBJECTIVE: The epileptogenic zone (EZ) is a brain region containing the sources of seizure genesis. Removal of the EZ is associated with cessation of seizures after resective surgical procedures, as measured by Engel Class I score. This study describes a novel EEG source imaging (ESI) method which uses cross frequency coupled potential signals (SCFC) derived from scalp EEG. METHODS: Scalp EEG were recorded from ten patients (20 seizures) suffering from epilepsy...
September 27, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27941990/non-sinusoidal-activity-can-produce-cross-frequency-coupling-in-cortical-signals-in-the-absence-of-functional-interaction-between-neural-sources
#20
Edden M Gerber, Boaz Sadeh, Andrew Ward, Robert T Knight, Leon Y Deouell
The analysis of cross-frequency coupling (CFC) has become popular in studies involving intracranial and scalp EEG recordings in humans. It has been argued that some cases where CFC is mathematically present may not reflect an interaction of two distinct yet functionally coupled neural sources with different frequencies. Here we provide two empirical examples from intracranial recordings where CFC can be shown to be driven by the shape of a periodic waveform rather than by a functional interaction between distinct sources...
2016: PloS One
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