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Gamma brainwave

Fran López-Caballero, Carles Escera
When two pure tones of slightly different frequencies are delivered simultaneously to the two ears, is generated a beat whose frequency corresponds to the frequency difference between them. That beat is known as acoustic beat. If these two tones are presented one to each ear, they still produce the sensation of the same beat, although no physical combination of the tones occurs outside the auditory system. This phenomenon is called binaural beat. In the present study, we explored the potential contribution of binaural beats to the enhancement of specific electroencephalographic (EEG) bands, as previous studies suggest the potential usefulness of binaural beats as a brainwave entrainment tool...
2017: Frontiers in Human Neuroscience
Luis Rafael L Sampaio, Lucas T N Borges, Joyse M F Silva, Francisca Roselin O de Andrade, Talita M Barbosa, Tatiana Q Oliveira, Danielle Macedo, Ricardo F Lima, Leonardo P Dantas, Manoel Cláudio A Patrocinio, Otoni C do Vale, Silvânia M M Vasconcelos
The use of ketamine (Ket) as a pharmacological model of schizophrenia is an important tool for understanding the main mechanisms of glutamatergic regulated neural oscillations. Thus, the aim of the current study was to evaluate Ket-induced changes in the average spectral power using the hippocampal quantitative electroencephalography (QEEG). To this end, male Wistar rats were submitted to a stereotactic surgery for the implantation of an electrode in the right hippocampus. After three days, the animals were divided into four groups that were treated for 10 consecutive days with Ket (10, 50, or 100 mg/kg)...
February 2018: Fundamental & Clinical Pharmacology
Claire Braboszcz, B Rael Cahn, Jonathan Levy, Manuel Fernandez, Arnaud Delorme
Despite decades of research, effects of different types of meditation on electroencephalographic (EEG) activity are still being defined. We compared practitioners of three different meditation traditions (Vipassana, Himalayan Yoga and Isha Shoonya) with a control group during a meditative and instructed mind-wandering (IMW) block. All meditators showed higher parieto-occipital 60-110 Hz gamma amplitude than control subjects as a trait effect observed during meditation and when considering meditation and IMW periods together...
2017: PloS One
Chun-Ju Chang, Tsui-Fen Yang, Sai-Wei Yang, Jen-Suh Chern
The cerebral cortex provides sensorimotor integration and coordination during motor control of daily functional activities. Power spectrum density based on electroencephalography (EEG) has been employed as an approach that allows an investigation of the spatial-temporal characteristics of neuromuscular modulation; however, the biofeedback mechanism associated with cortical activation during motor control remains unclear among elderly individuals. Thirty one community-dwelling elderly participants were divided into low fall-risk potential (LF) and high fall-risk potential (HF) groups based upon the results obtained from a receiver operating characteristic analysis of the ellipse area of the center of pressure...
2016: Frontiers in Aging Neuroscience
Michael M Maddox, Asis Lopez, Sree Harsha Mandava, Aaron Boonjindasup, Sarayuth Viriyasiripong, Jonathan L Silberstein, Benjamin R Lee
PURPOSE: To measure gamma and alpha brain wave activity as a measurement of concentration and stress levels during surgical simulator performance of laparoscopic tasks to determine if expert surgeons have different brain activity patterns compared with intermediate and novice surgeons. MATERIALS AND METHODS: After obtaining Institutional Review Board approval, 1st and 2nd year medical students, urology residents (PGY2-PGY5), and attending urologists from one institution were recruited...
December 2015: Journal of Endourology
Kiwoong Kim, Seong-Joo Lee, Chan Seok Kang, Seong-Min Hwang, Yong-Ho Lee, Kwon-Kyu Yu
Matching the proton-magnetic-resonance frequency to the frequency of a periodic neural oscillation (e.g., alpha or gamma band waves) by magnetic resonance imaging techniques, enables direct visualization of brain functional connectivity. Functional connectivity has been studied by analyzing the correlation between coherent neural oscillations in different areas of the brain. In electro- or magneto-encephalography, coherent source reconstruction in a source-space is very tricky due to power leaking from the correlation among the sources...
May 1, 2014: NeuroImage
Beverly Rubik
OBJECTIVES: This study had two aims: (1) to explore the inner experiences associated with increased production of gamma brainwaves in an initial neurofeedback experience; and (2) to measure and compare neurofeedback-enhanced increased output from the prefrontal cortical region of meditators and non-meditators, using the Peak Brain Happiness Trainer(™) neurofeedback system. DESIGN: This was a controlled pilot study; it involved a single session per subject. SETTING: The research was conducted in a nonprofit laboratory in the United States...
February 2011: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
Fred Travis, David A F Haaga, John Hagelin, Melissa Tanner, Alaric Arenander, Sanford Nidich, Carolyn Gaylord-King, Sarina Grosswald, Maxwell Rainforth, Robert H Schneider
Activation of a default mode network (DMN) including frontal and parietal midline structures varies with cognitive load, being more active during low-load tasks and less active during high-load tasks requiring executive control. Meditation practices entail various degrees of cognitive control. Thus, DMN activation patterns could give insight into the nature of meditation practices. This 10-week random assignment study compared theta2, alpha1, alpha2, beta1, beta2 and gamma EEG coherence, power, and eLORETA cortical sources during eyes-closed rest and Transcendental Meditation (TM) practice in 38 male and female college students, average age 23...
February 2010: Cognitive Processing
Udo Will, Eric Berg
As known, different brainwave frequencies show synchronies related to different perceptual, motor or cognitive states. Brainwaves have also been shown to synchronize with external stimuli with repetition rates of ca. 10-40 Hz. However, not much is known about responses to periodic auditory stimuli with periodicities found in human rhythmic behavior (i.e. 0.5-5 Hz). In an EEG study we compared responses to periodic stimulations (drum sounds and clicks with repetition rates of 1-8 Hz), silence, and random noise...
August 31, 2007: Neuroscience Letters
Frederick Travis, Alarik Arenander, David DuBois
This research extends and confirms recent brainwave findings that distinguished an individual's sense-of-self along an Object-referral/Self-referral Continuum of self-awareness. Subjects were interviewed and were given tests measuring inner/outer orientation, moral reasoning, anxiety, and personality. Scores on the psychological tests were factor analyzed. The first unrotated PCA component of the test scores yielded a "Consciousness Factor," analogous to the intelligence "g" factor, which accounted for over half of the variance among groups...
June 2004: Consciousness and Cognition
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