1,209 results match your criteria event-related synchronization


Statistical Learning and Prosodic Bootstrapping Differentially Affect Neural Synchronization during Speech Segmentation.

Neuroimage 2021 Apr 10:118051. Epub 2021 Apr 10.

Department of Cognition, Development and Educational Psychology, Campus Bellvitge, University of Barcelona, 5L'Hospitalet de Llobregat, 08097, Barcelona, Spain; Cognition and Brain Plasticity Group, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, 08097, Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats, ICREA, 08010, Barcelona, Spain. Electronic address:

Neural oscillations constitute an intrinsic property of functional brain organization that facilitates the tracking of linguistic units at multiple time scales through brain-to-stimulus alignment. This ubiquitous neural principle has been shown to facilitate speech segmentation and word learning based on statistical regularities. However, there is no common agreement yet on whether speech segmentation is mediated by a transition of neural synchronization from syllable to word rate, or whether the two time scales are concurrently tracked. Read More

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EEG measures for clinical research in major vascular cognitive impairment: recommendations by an expert panel.

Neurobiol Aging 2021 Mar 10;103:78-97. Epub 2021 Mar 10.

Izmir Biomedicine and Genome Center. Dokuz Eylul University Health Campus, Izmir, Turkey.

Vascular contribution to cognitive impairment (VCI) and dementia is related to etiologies that may affect the neurophysiological mechanisms regulating brain arousal and generating electroencephalographic (EEG) activity. A multidisciplinary expert panel reviewed the clinical literature and reached consensus about the EEG measures consistently found as abnormal in VCI patients with dementia. As compared to cognitively unimpaired individuals, those VCI patients showed (1) smaller amplitude of resting state alpha (8-12 Hz) rhythms dominant in posterior regions; (2) widespread increases in amplitude of delta (< 4 Hz) and theta (4-8 Hz) rhythms; and (3) delayed N200/P300 peak latencies in averaged event-related potentials, especially during the detection of auditory rare target stimuli requiring participants' responses in "oddball" paradigms. Read More

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Long Multi-Stage Training for a Motor-Impaired User in a BCI Competition.

Front Hum Neurosci 2021 25;15:647908. Epub 2021 Mar 25.

Université Côte d'Azur, Inria, France.

In a Mental Imagery Brain-Computer Interface the user has to perform a specific mental task that generates electroencephalography (EEG) components, which can be translated in commands to control a BCI system. The development of a high-performance MI-BCI requires a long training, lasting several weeks or months, in order to improve the ability of the user to manage his/her mental tasks. This works aims to present the design of a MI-BCI combining mental imaginary and cognitive tasks for a severely motor impaired user, involved in the BCI race of the Cybathlon event, a competition of people with severe motor disability. Read More

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Midfrontal theta as moderator between beta oscillations and precision control.

Neuroimage 2021 Apr 6:118022. Epub 2021 Apr 6.

Department of Sensorimotor Neuroscience, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.

Control of movements using visual information is crucial for many daily activities, and such visuomotor control has been revealed to be supported by alpha and beta cortical oscillations. However, it has been remained to be unclear how midfrontal theta and occipital gamma oscillations, which are associated with high-level cognitive functions, would be involved in this process to facilitate performance. Here we addressed this fundamental open question in healthy young adults by measuring high-density cortical activity during a precision force-matching task. Read More

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Neural coding of formant-exaggerated speech and nonspeech in children with and without autism spectrum disorders.

Autism Res 2021 Mar 31. Epub 2021 Mar 31.

Department of Speech-Language-Hearing Sciences & Center for Neurobehavioral Development, University of Minnesota, Twin Cities, Minnesota, USA.

The presence of vowel exaggeration in infant-directed speech (IDS) may adapt to the age-appropriate demands in speech and language acquisition. Previous studies have provided behavioral evidence of atypical auditory processing towards IDS in children with autism spectrum disorders (ASD), while the underlying neurophysiological mechanisms remain unknown. This event-related potential (ERP) study investigated the neural coding of formant-exaggerated speech and nonspeech in 24 4- to 11-year-old children with ASD and 24 typically-developing (TD) peers. Read More

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Frontal brain areas are more involved during motor imagery than during motor execution/preparation of a response sequence.

Int J Psychophysiol 2021 Feb 26;164:71-86. Epub 2021 Feb 26.

Laboratory of Vision Science and Optometry, Faculty of Physics, Adam Mickiewicz University, Poznań, Poland; Laboratory of Vision and Neuroscience, NanoBiomedical Center, Adam Mickiewicz University, Poznań, Poland.

Results of several neuroimaging studies support the functional equivalence model, which states that motor imagery (MI) and motor execution (ME) involve the same processes, except for the final execution component. In contrast, the motor-cognitive model implies that MI additionally involves frontal executive control processes. However, according to some authors MI may actually be more comparable to motor preparation (MP). Read More

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February 2021

Electrophysiological investigation of reward anticipation and outcome evaluation during slot machine play.

Neuroimage 2021 May 18;232:117874. Epub 2021 Feb 18.

Department of Psychiatry and Behavioral Sciences, Weill Institute for Neurosciences, University of California, San Francisco, 401 Parnassus Avenue, San Francisco, CA 94143, USA; San Francisco VA Health Care System, San Francisco, CA, USA.

Slot machines are a popular form of gambling, offering a tractable way to experimentally model reward processes. This study used a 3-reel slot paradigm to assess psychologically distinct phases of reward processing, reflecting anticipation, and early- and late-stage outcome processing. EEG measures of winning, nearly missing (a losing outcome revealed at the final, third reel), and "totally" missing (a losing outcome revealed earlier, at the second reel) were collected from healthy adults (n=54). Read More

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Event-Related Alpha-Band Power Changes During Self-reflection and Working Memory Tasks in Healthy Individuals.

Front Hum Neurosci 2020 25;14:570279. Epub 2021 Jan 25.

Department of Psychiatry, Faculty of Medicine, Saitama Medical University, Saitama, Japan.

Dysfunctional attentional control is observed in patients with mental disorders. However, there is no established neurophysiological method to assess attention in such patients. We showed a discrepancy in alpha-band power in the tasks that evoked internal and external attention event-related alpha-band power changes in healthy subjects during self-reflection (SR) and working memory (WM) tasks in a preliminary study. Read More

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January 2021

Working memory deficits in patients with idiopathic restless legs syndrome are associated with abnormal theta-band neural synchrony.

J Sleep Res 2021 Feb 9:e13287. Epub 2021 Feb 9.

Department of Neurology, Seoul National University Hospital, Seoul, South Korea.

Cognitive impairment, particularly prefrontal function, has been reported in patients with restless legs syndrome. However, working memory performance in patients with restless legs syndrome remains uncertain. The present study aimed to examine working memory performance in patients with restless legs syndrome by investigating electroencephalography theta-band oscillations within task-relevant brain regions and the synchronization among oscillations during a working memory task. Read More

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February 2021

Immediate and after effects of transcranial direct-current stimulation in the mouse primary somatosensory cortex.

Sci Rep 2021 Feb 4;11(1):3123. Epub 2021 Feb 4.

Department of Physiology, Anatomy and Cell Biology, Pablo de Olavide University, Ctra. de Utrera, km. 1, 41013, Seville, Spain.

Transcranial direct-current stimulation (tDCS) is a non-invasive brain stimulation technique consisting in the application of weak electric currents on the scalp. Although previous studies have demonstrated the clinical value of tDCS for modulating sensory, motor, and cognitive functions, there are still huge gaps in the knowledge of the underlying physiological mechanisms. To define the immediate impact as well as the after effects of tDCS on sensory processing, we first performed electrophysiological recordings in primary somatosensory cortex (S1) of alert mice during and after administration of S1-tDCS, and followed up with immunohistochemical analysis of the stimulated brain regions. Read More

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February 2021

Fact retrieval or compacted counting in arithmetic-A neurophysiological investigation of two hypotheses.

J Exp Psychol Learn Mem Cogn 2021 Feb 4. Epub 2021 Feb 4.

Parenting and Special Education Research Unit.

There is broad consensus on the assumption that adults solve single-digit multiplication problems almost exclusively by fact retrieval from memory. In contrast, there has been a long-standing debate on the cognitive processes involved in solving single-digit addition problems. This debate has evolved around two theoretical accounts. Read More

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February 2021

EEG signals respond differently to idea generation, idea evolution and evaluation in a loosely controlled creativity experiment.

Sci Rep 2021 Jan 22;11(1):2119. Epub 2021 Jan 22.

Concordia Institute for Information Systems Engineering, Gina Cody School of Engineering and Computer Science, Concordia University, Montreal, QC, Canada.

Many neurocognitive studies endeavor to understand neural mechanisms of basic creative activities in strictly controlled experiments. However, little evidence is available regarding the neural mechanisms of interactions between basic activities underlying creativity in such experiments. Moreover, strictly controlled experiments might limit flexibility/freedom needed for creative exploration. Read More

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January 2021

Cognitive deficits and rehabilitation mechanisms in mild traumatic brain injury patients revealed by EEG connectivity markers.

Clin Neurophysiol 2021 Feb 25;132(2):554-567. Epub 2020 Dec 25.

Department of Forensic Science, Soochow University, 215021 Suzhou, China. Electronic address:

Objective: To explore the multiple specific biomarkers and cognitive compensatory mechanisms of mild traumatic brain injury (mTBI) patients at recovery stage.

Methods: The experiment was performed in two sections. In Section I, using event-related potential, event-related oscillation and spatial phase-synchronization, we explored neural dynamics in 24 volunteered healthy controls (HC) and 38 patients at least 6 months post-mTBI (19 with epidural hematoma, EDH; 19 with subdural hematoma, SDH) during a Go/NoGo task. Read More

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February 2021

Regression-based analysis of combined EEG and eye-tracking data: Theory and applications.

J Vis 2021 Jan;21(1)

Institute of Cognitive Science, Universität Osnabrück, Osnabrück, Germany.

Fixation-related potentials (FRPs), neural responses aligned to the end of saccades, are a promising tool for studying the dynamics of attention and cognition under natural viewing conditions. In the past, four methodological problems have complicated the analysis of such combined eye-tracking/electroencephalogram experiments: (1) the synchronization of data streams, (2) the removal of ocular artifacts, (3) the condition-specific temporal overlap between the brain responses evoked by consecutive fixations, and (4) the fact that numerous low-level stimulus and saccade properties also influence the postsaccadic neural responses. Although effective solutions exist for the first two problems, the latter two are only beginning to be addressed. Read More

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January 2021

α-tACS over the somatosensory cortex enhances tactile spatial discrimination in healthy subjects with low alpha activity.

Brain Behav 2021 Mar 6;11(3):e02019. Epub 2021 Jan 6.

Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan.

Introduction: Spontaneous oscillations in the somatosensory cortex, especially of the alpha (8 - 14 Hz) and gamma (60 - 80 Hz) frequencies, affect tactile perception; moreover, these oscillations can be selectively modulated by frequency-matched transcranial alternating current stimulation (tACS) on the basis of ongoing oscillatory brain activity. To examine whether tACS can actually improve tactile perception via alpha and gamma modulation, we measured the effects of 10-Hz and 70-Hz tACS (α- and γ-tACS) on the left somatosensory cortex on right-finger tactile spatial orientation discrimination, and the associations between performance changes and individual alpha and gamma activities.

Methods: Fifteen neurologically healthy subjects were recruited into this study. Read More

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Oscillatory EEG Signatures of Affective Processes during Interaction with Adaptive Computer Systems.

Brain Sci 2020 Dec 31;11(1). Epub 2020 Dec 31.

Fraunhofer Institute for Industrial Engineering IAO, 70569 Stuttgart, Germany.

Affect monitoring is being discussed as a novel strategy to make adaptive systems more user-oriented. Basic knowledge about oscillatory processes and functional connectivity underlying affect during naturalistic human-computer interactions (HCI) is, however, scarce. This study assessed local oscillatory power entrainment and distributed functional connectivity in a close-to-naturalistic HCI-paradigm. Read More

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December 2020

Sustained attention to response task-related beta oscillations relate to performance and provide a functional biomarker in ALS.

J Neural Eng 2021 Jan 4. Epub 2021 Jan 4.

Academic Unit of Neurology, Trinity College Dublin Academic Unit of Neurology, 152-160 Pearse St., Dublin, D02 R590, IRELAND.

Objective: To characterize the cortical oscillations associated with performance of the sustained attention to response task (SART) and their disruptions in the neurodegenerative condition amyotrophic lateral sclerosis (ALS).

Approach: A randomised SART was undertaken by 24 ALS patients and 33 healthy controls during 128-channel electroencephalography. Complex Morlet wavelet transform was used to quantify non-phase-locked oscillatory activity in event-related spectral perturbations associated with performing the SART. Read More

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January 2021

Frontal Theta Oscillation as a Mechanism for Implicit Gender Stereotype Control: Electrophysiological Evidence From an Extrinsic Affective Simon Task.

Front Hum Neurosci 2020 17;14:573187. Epub 2020 Dec 17.

Department of Psychology, Zhejiang Normal University, Jinhua, China.

Previous research has indicated that frontal midline theta (FMθ) reflects a domain-general cognitive control mechanism of the prefrontal cortex. Brain imaging studies have shown that the inhibition of implicit stereotypes was dependent on this domain-general cognitive control mechanism. Based on this knowledge, the present study investigated the neural oscillatory correlates of implicit gender stereotype control in an extrinsic affective Simon task (EAST) using electrophysiological methods. Read More

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December 2020

Using Posterior EEG Theta Band to Assess the Effects of Architectural Designs on Landmark Recognition in an Urban Setting.

Front Hum Neurosci 2020 11;14:584385. Epub 2020 Dec 11.

Department of Design and Environmental Analysis, Cornell University, Ithaca, NY, United States.

The process of urban landmark-based navigation has proven to be difficult to study in a rigorous fashion, primarily due to confounding variables and the problem of obtaining reliable data in real-world contexts. The development of high-resolution, immersive virtual reality technologies has opened exciting new possibilities for gathering data on human wayfinding that could not otherwise be readily obtained. We developed a research platform using a virtual environment and electroencephalography (EEG) to better understand the neural processes associated with landmark usage and recognition during urban navigation tasks. Read More

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December 2020

Mapping cognitive brain functions at scale.

Neuroimage 2020 Dec 15;231:117641. Epub 2020 Dec 15.

Neural Engineering and Translation Labs, Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA. Electronic address:

A fundamental set of cognitive abilities enable humans to efficiently process goal-relevant information, suppress irrelevant distractions, maintain information in working memory, and act flexibly in different behavioral contexts. Yet, studies of human cognition and their underlying neural mechanisms usually evaluate these cognitive constructs in silos, instead of comprehensively in-tandem within the same individual. Here, we developed a scalable, mobile platform, "BrainE" (short for Brain Engagement), to rapidly assay several essential aspects of cognition simultaneous with wireless electroencephalography (EEG) recordings. Read More

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December 2020

Dynamic Modeling of Common Brain Neural Activity in Motor Imagery Tasks.

Front Neurosci 2020 19;14:714. Epub 2020 Nov 19.

Signal Processing and Recognition Group, Universidad Nacional de Colombia, Manizales, Colombia.

Evaluation of brain dynamics elicited by motor imagery (MI) tasks can contribute to clinical and learning applications. The multi-subject analysis is to make inferences on the group/population level about the properties of MI brain activity. However, intrinsic neurophysiological variability of neural dynamics poses a challenge for devising efficient MI systems. Read More

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November 2020

Expanding our understanding of sensory gating in children with autism spectrum disorders.

Clin Neurophysiol 2021 Jan 16;132(1):180-190. Epub 2020 Oct 16.

Department of Occupational Therapy, Colorado State University, Fort Collins, CO 80523, USA; Department of Molecular, Cellular, and Integrative Neuroscience, Colorado State University, Fort Collins, CO 80523, USA. Electronic address:

Objective: This study examined sensory gating in children with autism spectrum disorders (ASD). Gating is usually examined at the P50 component and rarely at mid- and late-latency components.

Methods: Electroencephalography data were recorded during a paired-click paradigm, from 18 children with ASD (5-12 years), and 18 typically-developing (TD) children. Read More

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January 2021

Entropy-Based Estimation of Event-Related De/Synchronization in Motor Imagery Using Vector-Quantized Patterns.

Entropy (Basel) 2020 Jun 24;22(6). Epub 2020 Jun 24.

Signal Processing and Recognition Group, Universidad Nacional de Colombia, Manizales 170004, Colombia.

Assessment of brain dynamics elicited by motor imagery (MI) tasks contributes to clinical and learning applications. In this regard, Event-Related Desynchronization/Synchronization (ERD/S) is computed from Electroencephalographic signals, which show considerable variations in complexity. We present an Entropy-based method, termed , for estimation of ERD/S using quantized stochastic patterns as a symbolic space, aiming to improve their discriminability and physiological interpretability. Read More

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Motor Imagery Hand Movement Direction Decoding Using Brain Computer Interface to Aid Stroke Recovery and Rehabilitation.

IEEE Trans Neural Syst Rehabil Eng 2020 12 28;28(12):3051-3062. Epub 2021 Jan 28.

Motor Imagery (MI)-based Brain Computer Interface (BCI) system is a potential technology for active neurorehabilitation of stroke patients by complementing the conventional passive rehabilitation methods. Research to date mainly focused on classifying left vs. right hand/foot MI of stroke patients. Read More

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December 2020

Phase 1 randomized study on the safety, tolerability, and pharmacodynamic cognitive and electrophysiological effects of a dopamine D receptor positive allosteric modulator in patients with schizophrenia.

Neuropsychopharmacology 2020 Nov 17. Epub 2020 Nov 17.

Astellas Pharma Global Development, Inc., Northbrook, IL, USA.

ASP4345, a novel dopamine D receptor positive allosteric modulator, is being evaluated for the treatment of cognitive impairment associated with schizophrenia (CIAS). This phase 1 multiple ascending-dose study (NCT02720263) assessed the safety, tolerability, and pharmacodynamics of ASP4345 in patients with schizophrenia/schizoaffective disorder. Pharmacodynamic assessments were Cogstate cognitive tests and electrophysiological biomarkers, including gamma-band power and phase synchronization in response to 40-Hz auditory steady-state stimulation, as well as mismatch negativity (MMN) and P3a event-related potentials. Read More

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November 2020

Modulation of neural oscillations during working memory update, maintenance, and readout: An hdEEG study.

Hum Brain Mapp 2021 Mar 17;42(4):1153-1166. Epub 2020 Nov 17.

Department of Experimental Medicine, Section of Human Physiology, University of Genoa, Genoa, Italy.

Working memory (WM) performance is very often measured using the n-back task, in which the participant is presented with a sequence of stimuli, and required to indicate whether the current stimulus matches the one presented n steps earlier. In this study, we used high-density electroencephalography (hdEEG) coupled to source localization to obtain information on spatial distribution and temporal dynamics of neural oscillations associated with WM update, maintenance and readout. Specifically, we a priori selected regions from a large fronto-parietal network, including also the insula and the cerebellum, and we analyzed modulation of neural oscillations by event-related desynchronization and synchronization (ERD/ERS). Read More

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Inter- and Intra-individual Variability in Brain Oscillations During Sports Motor Imagery.

Front Hum Neurosci 2020 30;14:576241. Epub 2020 Oct 30.

Institute of Neural Engineering, Graz University of Technology, Graz, Austria.

The aim of this work was to re-evaluate electrophysiological data from a previous study on motor imagery (MI) with a special focus on observed inter- and intra-individual differences. More concretely, we investigated event-related desynchronization/synchronization patterns during sports MI (playing tennis) compared with simple MI (squeezing a ball) and discovered high variability across participants. Thirty healthy volunteers were divided in two groups; the experimental group (EG) performed a physical exercise between two imagery sessions, and the control group (CG) watched a landscape movie without physical activity. Read More

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October 2020

[Neural Oscillations and Network Diseases of the Human Brain].

Authors:
Shozo Tobimatsu

Brain Nerve 2020 Nov;72(11):1183-1194

Department of Orthoptics, Faculty of Medical Science, Fukuoka International University of Health and Welfare.

Oscillatory neuronal (electrical) activity in defined frequency ranges supports synchronous interactions between anatomically distinct regions of the human brain during cognitive tasks. Here in, this study presents a review of our previous studies, focusing on the neural oscillations in the sensory systems in response to external stimuli in normal healthy subjects and those with neurological disorders. Event-related evoked responses, using magnetoencephalography and high-density electroencephalography, were applied to evaluate neuromagnetic oscillations. Read More

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November 2020

Changes in Balance, Gait and Electroencephalography Oscillations after Robot-Assisted Gait Training: An Exploratory Study in People with Chronic Stroke.

Brain Sci 2020 Nov 6;10(11). Epub 2020 Nov 6.

Neuroscience Laboratory, Department of Neurology, China Medical University Hospital, Taichung City 404, Taiwan.

Robot-assisted gait training (RAGT) systems offer the advantages of standard rehabilitation and provide precise and quantifiable control of therapy. We examined the clinical outcome of RAGT and analyzed the correlations between gait analysis data and event-related desynchronization (ERD) and event-related synchronization (ERS) in patients with chronic stroke. We applied the Berg balance scale (BBS) and analyzed gait parameters and the ERD and ERS of self-paced voluntary leg movements performed by patients with chronic stroke before and after undergoing RAGT. Read More

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November 2020

Differences in Power Spectral Densities and Phase Quantities Due to Processing of EEG Signals.

Sensors (Basel) 2020 Nov 4;20(21). Epub 2020 Nov 4.

School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia.

There has been a growing interest in computational electroencephalogram (EEG) signal processing in a diverse set of domains, such as cortical excitability analysis, event-related synchronization, or desynchronization analysis. In recent years, several inconsistencies were found across different EEG studies, which authors often attributed to methodological differences. However, the assessment of such discrepancies is deeply underexplored. Read More

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November 2020