EEG theta-band phase synchronization during electrical acupuncture in humans

2012 ◽  
Author(s):  
Xiaoxia Li ◽  
Guizhi Xu ◽  
Xiukui Shang
Keyword(s):  
Phase Synchronization ◽  
Theta Band ◽  
Electrical Acupuncture

scholarly journals Theta-Band Functional Connectivity and Single-Trial Cognitive Control in Sports-Related Concussion: Demonstration of Proof-of-Concept for a Potential Biomarker of Concussion

2019 ◽  
Vol 25 (3) ◽  
pp. 314-323 ◽  
Author(s):  
Ezra E. Smith ◽  
John J.B. Allen
Keyword(s):  
Head Injury ◽  
Functional Connectivity ◽  
Cognitive Control ◽  
Phase Synchronization ◽  
Control Measures ◽  
Single Trial ◽  
Brain Health ◽  
Theta Band ◽  
College Age ◽  
Potential Biomarker

AbstractObjectives: This report examined theta-band neurodynamics for potential biomarkers of brain health in athletes with concussion. Methods: Participants included college-age contact/collision athletes with (N=24) and without a history of concussion (N=16) in Study 1. Study 2 (N=10) examined changes over time in contact/collision athletes. There were two primary dependent variables: (1) theta-band phase-synchronization (e.g., functional connectivity) between medial and right-lateral electrodes; and (2) the within-subject correlation between synchronization strength on error trials and post-error reaction time (i.e., operationalization of cognitive control). Results: Head injury history was inversely related with medial-lateral connectivity. Head injury was also related to declines in a neurobehavioral measure of cognitive control (i.e., the single-trial relationship between connectivity and post-error slowing). Conclusions: Results align with a theory of connectivity-mediated cognitive control. Mild injuries undetectable by behavioral measures may still be apparent on direct measures of neural functioning. This report demonstrates that connectivity and cognitive control measures may be useful for tracking recovery from concussion. Theoretically relevant neuroscientific findings in healthy adults may have applications in patient populations, especially with regard to monitoring brain health. (JINS 2019, 25, 314–323)

Changes in gamma- and theta-band phase synchronization patterns due to the difficulty of auditory oddball task

2010 ◽  
Vol 468 (2) ◽  
pp. 156-160 ◽  
Author(s):  
Jeong Woo Choi ◽  
Ki-Young Jung ◽  
Chi Hyun Kim ◽  
Kyung Hwan Kim
Keyword(s):  
Phase Synchronization ◽  
Theta Band ◽  
Auditory Oddball ◽  
Oddball Task ◽  
Auditory Oddball Task

Alpha-Band EEG Synchronization during Electrical Acupuncture

2013 ◽  
Vol 448-453 ◽  
pp. 3566-3570
Author(s):  
Xiao Xia Li ◽  
Gui Zhi Xu ◽  
Xiu Kui Shang
Keyword(s):  
Nervous System ◽  
Phase Synchronization ◽  
Heart Diseases ◽  
Alpha Band ◽  
Attention Tasks ◽  
Electrical Acupuncture ◽  
Transient Network ◽  
Cognitive Attention ◽  
Cortical Regions ◽  
The Brain

In the present study, the patterns of phase synchronization in an acupuncturing task were investigated. Neiguan (PC6) and Shenmen (HT7) are the main acupoints, they are both the main points for heart diseases and insomnia, epilepsy, mental disorder. The task was divided up into the following parts, the resting condition; needling sensation; needling with power on for 20 minutes; needling retaining and needling extraction. The index of phase synchronization in different parts was calculated and compared. Phase synchronization was increased in alpha band in many cognitive, attention tasks. These findings suggest that the transient network of coupled cortical regions maybe mediated through neural synchronization. The result in this paper shows that during electro-acupuncture about 15 minutes, the index between the available electrodes in the hindbrain, especially after electrode CP6, and all the available electrodes in the brain increased. That means phase synchronization increased between the hindbrain regions and whole brain during the electrical-acupuncture about 15 minutes. It could be an evidence of regulating both the peripheral nervous system and central nervous system with stimulating these two points.

Motion sickness-susceptible participants exposed to coherent rotating dot patterns show excessive N2 amplitudes and impaired theta-band phase synchronization

NeuroImage ◽  
2019 ◽  
Vol 202 ◽  
pp. 116028
Author(s):  
Yue Wei ◽  
Yuka O. Okazaki ◽  
Richard H.Y. So ◽  
Winnie C.W. Chu ◽  
Keiichi Kitajo
Keyword(s):  
Motion Sickness ◽  
Phase Synchronization ◽  
Theta Band

Functional Connectivity Alterations Based on the Weighted Phase Lag Index: An Exploratory Electroencephalography Study on Alzheimer’s Disease

2021 ◽  
Vol 18 ◽  
Author(s):  
Yi Yan ◽  
Aonan Zhao ◽  
Yinghui Qiu ◽  
Yanfei Ding ◽  
Ying Wang ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Functional Connectivity ◽  
Phase Synchronization ◽  
Significant Negative Correlation ◽  
Phase Lag ◽  
Connection Strength ◽  
Theta Band ◽  
Delta Band ◽  
Weighted Phase Lag Index

Objectives: Numerous electroencephalography (EEG) studies focus on the alteration of electrical activity in patients with Alzheimer’s Disease (AD), but there are no consistent results es- pecially regarding functional connectivity. We supposed that the weighted Phase Lag Index (w- PLI), as phase-based measures of functional connectivity, may be used as an auxiliary diagnostic method for AD. Methods: We enrolled 30 patients with AD, 30 patients with Mild Cognitive Impairment (MCI), and 30 Healthy Controls (HC). EEGs were recorded in all participants at baseline during relaxed wakefulness. Following EEG preprocessing, Power Spectral Density (PSD) and wPLI parameters were determined to further analyze whether they were correlated to cognitive scores. Results: In the patients with AD, the increased PSD in theta band was presented compared with MCI and HC groups, which was associated with disturbances of the directional, computational, and delayed memory capacity. Furthermore, the wPLI revealed a distinctly lower connection strength between frontal and distant areas in the delta band and a higher connection strength of the central and temporo-occipital region in the theta band for AD patients. Moreover,we found a significant negative correlation between theta functional connectivity and cognitive scores. Conclusions: Increased theta PSD and decreased delta wPLI may be one of the earliest changes in AD and associated with disease severity. The parameter wPLI is a novel measurement of phase synchronization and has potentials in understanding underlying functional connectivity and aiding in the diagnostics of AD.

scholarly journals Oscillatory Mechanisms of Response Conflict Elicited by Color and Motion Direction: An Individual Differences Approach

2018 ◽  
Vol 30 (4) ◽  
pp. 468-481 ◽  
Author(s):  
Marlies E. Vissers ◽  
K. Richard Ridderinkhof ◽  
Michael X. Cohen ◽  
Heleen A. Slagter
Keyword(s):  
Individual Differences ◽  
Phase Synchronization ◽  
Simon Task ◽  
Response Conflict ◽  
Large Individual ◽  
Theta Band ◽  
Motion Direction ◽  
Stimulus Color ◽  
Theta Power ◽  
Feature Dimension

Goal-directed behavior requires control over automatic behavior, for example, when goal-irrelevant information from the environment captures an inappropriate response and conflicts with the correct, goal-relevant action. Neural oscillations in the theta band (∼6 Hz) measured at midfrontal electrodes are thought to form an important substrate of the detection and subsequent resolution of response conflict. Here, we examined the extent to which response conflict and associated theta-band activity depend on the visual stimulus feature dimension that triggers the conflict. We used a feature-based Simon task to manipulate conflict by motion direction and stimulus color. Analyses were focused on individual differences in behavioral response conflict elicited across different stimulus dimensions and their relationship to conflict-related midfrontal theta. We first confirmed the presence of response conflict elicited by task-irrelevant motion and stimulus color, demonstrating the usefulness of our modified version of the Simon task to assess different sensory origins of response conflict. Despite titrating overall task performance, we observed large individual differences in the behavioral manifestations of response conflict elicited by the different visual dimensions. These behavioral conflict effects were mirrored in a dimension-specific relationship with conflict-related midfrontal theta power, such that, for each dimension, individual midfrontal theta power was generally higher when experienced response conflict was high. Finally, exploratory analyses of interregional functional connectivity suggested a role for phase synchronization between frontal and parietal scalp sites in modulating experienced conflict when color was the task-relevant visual dimension. Highlighting the importance of an individual differences approach in cognitive neuroscience, these results reveal large individual differences in experienced response conflict depending on the source of visual interference, which are predicted by conflict-related midfrontal theta power.

Electrical Acupuncture Efficacy on Inflammatory Pain

2018 ◽  
Vol 28 (3) ◽  
pp. 32
Author(s):  
Minghong SUI ◽  
Jingjing LI ◽  
Yun XIANG ◽  
Guojian SHU ◽  
Dongmei JIN ◽  
...  
Keyword(s):  
Inflammatory Pain ◽  
Electrical Acupuncture

scholarly journals Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2286
Author(s):  
Yutaka Hara ◽  
Yoshifumi Jodai ◽  
Tomoyuki Okinaga ◽  
Masaru Furukawa
Keyword(s):  
Wind Turbines ◽  
Power Distribution ◽  
Phase Synchronization ◽  
Average Power ◽  
Vertical Axis ◽  
Turbine Rotor ◽  
Mean Power ◽  
Vertical Axis Wind Turbines ◽  
Fluid Body ◽  
First Time

To investigate the optimum layouts of small vertical-axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations. The rotational speed of each turbine rotor (diameter: D = 50 mm) varies based on the equation of motion. First, the dependence of rotor performance on the gap distance (gap) between two rotors is investigated. For parallel layouts, counter-down (CD) layouts with blades moving downwind in the gap region yield a higher mean power than counter-up (CU) layouts with blades moving upwind in the gap region. CD layouts with gap/D = 0.5–1.0 yield a maximum average power that is 23% higher than that of an isolated single rotor. Assuming isotropic bidirectional wind speed, co-rotating (CO) layouts with the same rotational direction are superior to the combination of CD and CU layouts regardless of the gap distance. For tandem layouts, the inverse-rotation (IR) configuration shows an earlier wake recovery than the CO configuration. For 16-wind-direction layouts, both the IR and CO configurations indicate similar power distribution at gap/D = 2.0. For the first time, this study demonstrates the phase synchronization of two rotors via numerical simulation.

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