1,067 results match your criteria oscillatory activities

Farey Trees Explain Sequential Effects in Choice Response Time.

Front Physiol 2021 17;12:611145. Epub 2021 Mar 17.

The Complexity Group, Department of Psychology, University of Cincinnati, Cincinnati, OH, United States.

The latencies of successive two-alternative, forced-choice response times display intricately patterned sequential effects, or dependencies. They vary as a function of particular trial-histories, and in terms of the order and identity of previously presented stimuli and registered responses. This article tests a novel hypothesis that sequential effects are governed by dynamic principles, such as those entailed by a discrete sine-circle map adaptation of the Haken Kelso Bunz (HKB) bimanual coordination model. Read More

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Frequency- and Area-Specific Phase Entrainment of Intrinsic Cortical Oscillations by Repetitive Transcranial Magnetic Stimulation.

Front Hum Neurosci 2021 12;15:608947. Epub 2021 Mar 12.

RIKEN CBS-TOYOTA Collaboration Center, RIKEN Center for Brain Science, Wako, Japan.

Synchronous oscillations are ubiquitous throughout the cortex, but the frequency of oscillations differs from area to area. To elucidate the mechanistic architectures underlying various rhythmic activities, we tested whether spontaneous neural oscillations in different local cortical areas and large-scale networks can be phase-entrained by direct perturbation with distinct frequencies of repetitive transcranial magnetic stimulation (rTMS). While recording the electroencephalogram (EEG), we applied single-pulse TMS (sp-TMS) and rTMS at 5, 11, and 23 Hz over the motor or visual cortex. Read More

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Inhibition of 14-3-3 Proteins Alters Neural Oscillations in Mice.

Front Neural Circuits 2021 12;15:647856. Epub 2021 Mar 12.

Department of Biomedical Sciences, Florida State University College of Medicine, Tallahassee, FL, United States.

Accumulating evidence suggests that schizophrenia is a disorder of the brain's communication, a result of functional and structural dysconnectivities. Patients with schizophrenia exhibit irregular neuronal circuit and network activity, but the causes and consequences of such activity remain largely unknown. Inhibition of 14-3-3 proteins in the mouse brain leads to the expression of multiple schizophrenia endophenotypes. Read More

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Brain rhythm bursts are enhanced by multiplicative noise.

Chaos 2021 Jan;31(1):013117

Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.

Many healthy and pathological brain rhythms, including beta and gamma rhythms and essential tremor, are suspected to be induced by noise. This yields randomly occurring, brief epochs of higher amplitude oscillatory activity known as "bursts," the statistics of which are important for proper neural function. Here, we consider a more realistic model with both multiplicative and additive noise instead of only additive noise, to understand how state-dependent fluctuations further affect rhythm induction. Read More

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January 2021

Enhancement of dynamical robustness in a mean-field coupled network through self-feedback delay.

Chaos 2021 Jan;31(1):013114

Department of Mathematics, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore 641 112, India.

The network of self-sustained oscillators plays an important role in exploring complex phenomena in many areas of science and technology. The aging of an oscillator is referred to as turning non-oscillatory due to some local perturbations that might have adverse effects in macroscopic dynamical activities of a network. In this article, we propose an efficient technique to enhance the dynamical activities for a network of coupled oscillators experiencing aging transition. Read More

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January 2021

Specific modulation of corticomuscular coherence during submaximal voluntary isometric, shortening and lengthening contractions.

Sci Rep 2021 Mar 18;11(1):6322. Epub 2021 Mar 18.

ToNIC, Université de Toulouse, Inserm, UPS, Toulouse, France.

During voluntary contractions, corticomuscular coherence (CMC) is thought to reflect a mutual interaction between cortical and muscle oscillatory activities, respectively measured by electroencephalography (EEG) and electromyography (EMG). However, it remains unclear whether CMC modulation would depend on the contribution of neural mechanisms acting at the spinal level. To this purpose, modulations of CMC were compared during submaximal isometric, shortening and lengthening contractions of the soleus (SOL) and the medial gastrocnemius (MG) with a concurrent analysis of changes in spinal excitability that may be reduced during lengthening contractions. Read More

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Target Amplification and Distractor Inhibition: Theta Oscillatory Dynamics of Selective Attention in a Flanker Task.

Cogn Affect Behav Neurosci 2021 Mar 15. Epub 2021 Mar 15.

University of Trier, Universitätsring 15, 54286, Trier, Germany.

Selective attention is a key mechanism to monitor conflict-related processing and behaviour, by amplifying task-relevant processing and inhibiting task-irrelevant information. Conflict monitoring and resolution is typically associated with brain oscillatory power increase in the theta frequency range (3-8 Hz), as indexed by increased midfrontal theta power. We expand previous findings of theta power increase related to conflict processing and distractor inhibition by considering attentional target amplification to be represented in theta frequency as well. Read More

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Modeling herbivore functional responses causing boom-bust dynamics following predator removal.

Ecol Evol 2021 Mar 7;11(5):2209-2220. Epub 2021 Feb 7.

School of Mathematical Sciences Queensland University of Technology Brisbane Qld Australia.

Native biodiversity is threatened by invasive species in many terrestrial and marine systems, and conservation managers have demonstrated successes by responding with eradication or control programs. Although invasive species are often the direct cause of threat to native species, ecosystems can react in unexpected ways to their removal or reduction. Here, we use theoretical models to predict boom-bust dynamics, where the removal of predatory or competitive pressure from a native herbivore results in oscillatory population dynamics (boom-bust), which can endanger the native species' population in the short term. Read More

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Steady state evoked potential (SSEP) responses in the primary and secondary somatosensory cortices of anesthetized cats: Nonlinearity characterized by harmonic and intermodulation frequencies.

PLoS One 2021 9;16(3):e0240147. Epub 2021 Mar 9.

Turner Institute for Brain and Mental Health, School of Psychological Science, Monash University, Melbourne, Victoria, Australia.

When presented with an oscillatory sensory input at a particular frequency, F [Hz], neural systems respond with the corresponding frequency, f [Hz], and its multiples. When the input includes two frequencies (F1 and F2) and they are nonlinearly integrated in the system, responses at intermodulation frequencies (i.e. Read More

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Frontoparietal Beta Amplitude Modulation and its Interareal Cross-frequency Coupling in Visual Working Memory.

Neuroscience 2021 04 13;460:69-87. Epub 2021 Feb 13.

Institute of Cognitive Neuroscience, National Central University, Taoyuan, Taiwan; Cognitive Intelligence and Precision Healthcare Center, National Central University, Taoyuan, Taiwan; Brain Research Center, College of Health Sciences and Technology, National Central University, Taoyuan, Taiwan; Department of Psychology, Kaohsiung Medical University, Kaohsiung, Taiwan.

Visual working memory (VWM) relies on sustained neural activities that code information via various oscillatory frequencies. Previous studies, however, have emphasized time-frequency power changes, while overlooking the possibility that rhythmic amplitude variations can also code frequency-specific VWM information in a completely different dimension. Here, we employed the recently-developed Holo-Hilbert spectral analysis to characterize such nonlinear amplitude modulation(s) (AM) underlying VWM in the frontoparietal systems. Read More

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The Effects of Priming Intermittent Theta Burst Stimulation on Movement-Related and Mirror Visual Feedback-Induced Sensorimotor Desynchronization.

Front Hum Neurosci 2021 29;15:626887. Epub 2021 Jan 29.

Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong.

The potential benefits of priming intermittent theta burst stimulation (iTBS) with continuous theta burst stimulation (cTBS) have not been examined in regard to sensorimotor oscillatory activities recorded in electroencephalography (EEG). The objective of this study was to investigate the modulatory effect of priming iTBS (cTBS followed by iTBS) delivered to the motor cortex on movement-related and mirror visual feedback (MVF)-induced sensorimotor event-related desynchronization (ERD), compared with iTBS alone, on healthy adults. Twenty participants were randomly allocated into Group 1: priming iTBS-cTBS followed by iTBS, and Group 2: non-priming iTBS-sham cTBS followed by iTBS. Read More

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January 2021

Gamma-Range Auditory Steady-State Responses and Cognitive Performance: A Systematic Review.

Brain Sci 2021 Feb 10;11(2). Epub 2021 Feb 10.

Institute of Biosciences, Life Sciences Centre, Vilnius University, Sauletekio ave 7, LT-10257 Vilnius, Lithuania.

The auditory steady-state response (ASSR) is a result of entrainment of the brain's oscillatory activity to the frequency and phase of temporally modulated stimuli. Gamma-range ASSRs are utilized to observe the dysfunctions of brain-synchronization abilities in neuropsychiatric and developmental disorders with cognitive symptoms. However, the link between gamma-range ASSRs and cognitive functioning is not clear. Read More

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February 2021

Modeling of Endothelial Calcium Responses within a Microfluidic Generator of Spatio-Temporal ATP and Shear Stress Signals.

Micromachines (Basel) 2021 Feb 7;12(2). Epub 2021 Feb 7.

School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China.

Intracellular calcium dynamics play essential roles in the proper functioning of cellular activities. It is a well known important chemosensing and mechanosensing process regulated by the spatio-temporal microenvironment. Nevertheless, how spatio-temporal biochemical and biomechanical stimuli affect calcium dynamics is not fully understood and the underlying regulation mechanism remains missing. Read More

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February 2021

Oscillatory activity in the BNST/ALIC and the frontal cortex in OCD: acute effects of DBS.

J Neural Transm (Vienna) 2021 Feb 3;128(2):215-224. Epub 2021 Feb 3.

Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany.

Deep brain stimulation (DBS) of the bed nucleus of the stria terminalis/anterior limb of the internal capsule (BNST/ALIC) is successfully used for treatment of patients with obsessive-compulsive disorder (OCD). Clinical and experimental studies have suggested that enhanced network synchronization in the theta band is correlated with severity of symptoms. The mechanisms of action of DBS remain unclear in OCD. Read More

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February 2021

Modelling and prediction of the dynamic responses of large-scale brain networks during direct electrical stimulation.

Nat Biomed Eng 2021 Apr 1;5(4):324-345. Epub 2021 Feb 1.

Ming Hsieh Department of Electrical and Computer Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA.

Direct electrical stimulation can modulate the activity of brain networks for the treatment of several neurological and neuropsychiatric disorders and for restoring lost function. However, precise neuromodulation in an individual requires the accurate modelling and prediction of the effects of stimulation on the activity of their large-scale brain networks. Here, we report the development of dynamic input-output models that predict multiregional dynamics of brain networks in response to temporally varying patterns of ongoing microstimulation. Read More

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Objective Extraction of Evoked Event-Related Oscillation from Time-Frequency Representation of Event-Related Potentials.

Neural Plast 2020 19;2020:8841354. Epub 2020 Dec 19.

School of Biomedical Engineering, Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China.

Evoked event-related oscillations (EROs) have been widely used to explore the mechanisms of brain activities for both normal people and neuropsychiatric disease patients. In most previous studies, the calculation of the regions of evoked EROs of interest is commonly based on a predefined time window and a frequency range given by the experimenter, which tends to be subjective. Additionally, evoked EROs sometimes cannot be fully extracted using the conventional time-frequency analysis (TFA) because they may be overlapped with each other or with artifacts in time, frequency, and space domains. Read More

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December 2020

Adaptive behaviour and learning in slime moulds: the role of oscillations.

Philos Trans R Soc Lond B Biol Sci 2021 Mar 25;376(1820):20190757. Epub 2021 Jan 25.

Research Centre on Animal Cognition (CRCA), Centre for Integrative Biology (CBI), Toulouse University, CNRS, UPS, Toulouse 31062, France.

The slime mould , an aneural organism, uses information from previous experiences to adjust its behaviour, but the mechanisms by which this is accomplished remain unknown. This article examines the possible role of oscillations in learning and memory in slime moulds. Slime moulds share surprising similarities with the network of synaptic connections in animal brains. Read More

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Harmine alleviates atherogenesis by inhibiting disturbed flow-mediated endothelial activation via protein tyrosine phosphatase PTPN14 and YAP.

Br J Pharmacol 2021 Apr 15;178(7):1524-1540. Epub 2021 Feb 15.

Tianjin Key Laboratory of Metabolic Diseases, Collaborative Innovation Center of Tianjin for Medical Epigenetics and Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, China.

Background And Purpose: Disturbed flow induces endothelial dysfunction and contributes to uneven distribution of atherosclerotic plaque. Emerging evidence suggests that harmine, a natural constituent of extracts of Peganum harmala, has potent beneficial activities. Here, we investigated if harmine has an atheroprotective role under disturbed flow and the underlying mechanism. Read More

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Off-line effects of alpha-frequency transcranial alternating current stimulation on a visuomotor learning task.

Brain Behav 2020 09 27;10(9):e01754. Epub 2020 Jul 27.

Faculty of Welfare and Health Science, Oita University, Oita, Japan.

Introduction: It has been suggested that transcranial alternating current stimulation (tACS) at both alpha and beta frequencies promotes motor function as well as motor learning. However, limited information exists on the aftereffects of tACS on motor learning and neurophysiological profiles such as entrainment and neural plasticity in parallel. Therefore, in the present study, we examined the effect of tACS on motor learning and neurophysiological profiles using an off-line tACS condition. Read More

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September 2020

Virtual reality alters cortical oscillations related to visuo-tactile integration during rubber hand illusion.

Sci Rep 2021 Jan 14;11(1):1436. Epub 2021 Jan 14.

Human Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan.

Virtual reality (VR) enables the fast, free, and highly controllable setting of experimental body images. Illusions pertaining to a body, such as the rubber hand illusion (RHI), can be easily conducted in VR settings, and some phenomena, such as full-body illusions, are only realized in virtual environments. However, the multisensory-integration process in VR is not yet fully understood. 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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Dynamics in cortical activity revealed by resting-state MEG rhythms.

Chaos 2020 Dec;30(12):123138

Department of Biomedical Engineering, Universidad de los Andes, Cr 1 #18A-12, Bogotá, Colombia.

The brain is a biophysical system subject to information flows that may be thought of as a many-body architecture with a spatiotemporal dynamics described by its neuronal structures. The oscillatory nature of brain activity allows these structures (nodes) to be described as a set of coupled oscillators forming a network where the node dynamics and that of the network topology can be studied. Quantifying its dynamics at various scales is an issue that claims to be explored for several brain activities, e. Read More

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December 2020

Motor Cortical Activity during Observing a Video of Real Hand Movements versus Computer Graphic Hand Movements: An MEG Study.

Brain Sci 2020 Dec 23;11(1). Epub 2020 Dec 23.

Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.

Both action observation (AO) and virtual reality (VR) provide visual stimuli to trigger brain activations during the observation of actions. However, the mechanism of observing video movements performed by a person's real hand versus that performed by a computer graphic hand remains uncertain. We aimed to investigate the differences in observing the video of real versus computer graphic hand movements on primary motor cortex (M1) activation by magnetoencephalography. Read More

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December 2020

The interaction of the circadian and immune system: Desynchrony as a pathological outcome to traumatic brain injury.

Neurobiol Sleep Circadian Rhythms 2020 Nov 10;9:100058. Epub 2020 Oct 10.

Department of Neuroscience, Central Clinical School, Monash University, Melbourne, Australia.

Traumatic brain injury (TBI) is a complex and costly worldwide phenomenon that can lead to many negative health outcomes including disrupted circadian function. There is a bidirectional relationship between the immune system and the circadian system, with mammalian coordination of physiological activities being controlled by the primary circadian pacemaker in the suprachiasmatic nucleus (SCN) of the hypothalamus. The SCN receives light information from the external environment and in turn synchronizes rhythms throughout the brain and body. Read More

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November 2020

Ramelteon modulates gamma oscillations in the rat primary motor cortex during non-REM sleep.

J Pharmacol Sci 2021 Jan 20;145(1):97-104. Epub 2020 Nov 20.

Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan. Electronic address:

Sleep disorders adversely affect daily activities and cause physiological and psychiatric problems. The shortcomings of benzodiazepine hypnotics have led to the development of ramelteon, a melatonin MT and MT agonist. Although the sleep-promoting effects of ramelteon have been documented, few studies have precisely investigated the structure of sleep and neural oscillatory activities. Read More

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January 2021

Evoked and induced power oscillations linked to audiovisual integration of affect.

Biol Psychol 2021 Jan 7;158:108006. Epub 2020 Dec 7.

Department of Psychology, Institute for Mind and Brain, University of South Carolina, Columbia, SC, 29201, USA. Electronic address:

Our affective experiences are influenced by combined multisensory information. Although the enhanced effects of congruent audiovisual information on our affective experiences have been well documented, the role of neural oscillations in the audiovisual integration of affective signals remains unclear. First, it is unclear whether oscillatory activity changes as a function of valence. Read More

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January 2021

Induced brain magnetic activities related to salient birdsong under noisy conditions.

Neuroreport 2021 01;32(2):82-87

Medical and Biological Engineering Research Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Midorigaoka, Ikeda, Osaka, Japan.

Objective: Birdsong sounds are often used to inform visually-challenged people about the presence of basic infrastructures, and therefore need to be salient in noisy urban environments. How salient sounds are processed in the brain could inform us about the optimal birdsong in such environments. However, brain activity related to birdsong salience is not yet known. Read More

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January 2021

Behavioral, Physiological and EEG Activities Associated with Conditioned Fear as Sensors for Fear and Anxiety.

Sensors (Basel) 2020 Nov 26;20(23). Epub 2020 Nov 26.

Department of Neurosurgery, Johns Hopkins University, Baltimore, MD 21287-7713, USA.

Anxiety disorders impose substantial costs upon public health and productivity in the USA and worldwide. At present, these conditions are quantified by self-report questionnaires that only apply to behaviors that are accessible to consciousness, or by the timing of responses to fear- and anxiety-related words that are indirect since they do not produce fear, e.g. Read More

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November 2020

The frequency spectrum of sympathetic nerve activity and arrhythmogenicity in ambulatory dogs.

Heart Rhythm 2021 Mar 24;18(3):465-472. Epub 2020 Nov 24.

Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Cedars-Sinai Medical Center, Los Angeles, California. Electronic address:

Background: Sympathetic nerve activity, heart rate (HR), and blood pressure (BP) all have very low frequency (VLF), low frequency (LF), and high frequency (HF) oscillations.

Objective: The purpose of this study was to test the hypothesis that the frequency spectra of subcutaneous nerve activity (ScNA), stellate ganglion nerve activity (SGNA), HR, and BP are important to cardiac arrhythmogenesis.

Methods: We used radiotransmitters to record SGNA, ScNA, HR, and BP in 6 ambulatory dogs and determined the dominant frequency and paroxysmal atrial tachyarrhythmias (PATs) episodes in 3-minute windows over a 24-hour period. Read More

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Treating low back pain - Bridging the gap between manual therapy and exercise.

Arie Michaeli

J Bodyw Mov Ther 2020 Oct 30;24(4):452-461. Epub 2020 Jul 30.

Clinical Solutions, Johannesburg, Gauteng, South Africa. Electronic address:

As therapists, we often recommend exercise to reduce patients' low-back pain, as well as increase their active range of motion and muscle strength. However, physical therapists face a challenge when recommending exercise to reduce low-back pain because the pain itself often inhibits the patient's ability to exercise or perform activities of daily living. This situation becomes even more challenging if the prescribed exercise program aggravates the individual's low-back pain. Read More

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October 2020