scholarly journals EEG Responses to Shamanic Drumming. Does the Suggestion of Trance State Moderate the Strength of Frequency Components?

2018 ◽  
pp. 16-25
Author(s):  
Mateusz Konopacki ◽  
Guy Madison
Keyword(s):  
Alpha Frequency ◽  
Frequency Components ◽  
Frequency Power

One of the techniques used to induce trance state in shamanic ceremonies is monotonous drumming. According to previous EEG research, certain patterns of drumming cause an increase in power of alpha and theta frequencies of the listener. Present study aimed to determine, if suggestion to experience trance state could increase the relative alpha and theta amplitude and the intensity of experienced state. A group of twenty-four subjects participated in the study. Suggestion to experience trance state decreased alpha frequency power during the drumming condition. No other significant effects of suggestion or drumming were found.

EEG Upper/Low Alpha Frequency Power Ratio and the Impulsive Disorders Network in Subjects with Mild Cognitive Impairment.

2014 ◽  
Vol 11 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Davide Moretti ◽  
Donata Paternico ◽  
Giuliano Binetti ◽  
Orazio Zanetti ◽  
Giovanni Frisoni
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Power Ratio ◽  
Alpha Frequency ◽  
Frequency Power

Electroencephalographic Upper/Low Alpha Frequency Power Ratio Relates to Cortex Thinning in Mild Cognitive Impairment

2014 ◽  
Vol 14 (1) ◽  
pp. 18-30 ◽  
Author(s):  
D.V. Moretti ◽  
D. Paternicò ◽  
G. Binetti ◽  
O. Zanetti ◽  
G.B. Frisoni
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Power Ratio ◽  
Alpha Frequency ◽  
Frequency Power

Natural alpha frequency components in resting EEG and their relation to arousal

2020 ◽  
Vol 131 (1) ◽  
pp. 205-212 ◽  
Author(s):  
Robert J. Barry ◽  
Frances M. De Blasio ◽  
Jack S. Fogarty ◽  
Adam R. Clarke
Keyword(s):  
Alpha Frequency ◽  
Frequency Components

Cerebral PET glucose hypometabolism in subjects with mild cognitive impairment and higher EEG high-alpha/low-alpha frequency power ratio

2017 ◽  
Vol 58 ◽  
pp. 213-224 ◽  
Author(s):  
Davide Vito Moretti ◽  
Michela Pievani ◽  
Lorenzo Pini ◽  
Ugo Paolo Guerra ◽  
Barbara Paghera ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Power Ratio ◽  
Alpha Frequency ◽  
Frequency Power ◽  
Glucose Hypometabolism

Effect of Inhalation of 30% Nitrous Oxide on Spectral Components of Heart Rate Variability in Conscious man

1993 ◽  
Vol 85 (4) ◽  
pp. 389-392 ◽  
Author(s):  
D. C. Galletly ◽  
P. D. Tobin ◽  
B.J. Robinson ◽  
T. Corfiatis
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Frequency Spectrum ◽  
High Frequency ◽  
Low Frequency ◽  
Spectral Components ◽  
Frequency Components ◽  
The Mean ◽  
Frequency Power ◽  
High Frequency Spectrum

1. Periodicities in cardiac interbeat interval may be resolved into discrete frequency components by applying Fourier analysis to heart rate time series. Low-frequency components (<0.15 Hz) are believed to be under parasympathetic and sympathetic control, whereas a higher frequency component in phase with respiration is believed to be entirely parasympathetic. The ratio of the power in the low-/high-frequency spectrum gives an estimate of sympathetic/para-sympathetic balance. 2. This study examined, using heart rate variability spectral analysis, the cardiac autonomic effects of breathing 30% N2O in normal subjects. While supine, the inhalation of N2O caused a significant fall in high-frequency power and a rise in the low-/high-frequency spectrum. During air breathing, tilting caused a significant rise in the mean blood pressure, heart rate, low-frequency power and low-/high-frequency spectrum. During N2O breathing, tilting caused a rise in the heart rate and the mean blood pressure, but no significant alteration in the power of individual spectral components. During tilting, the heart rate, the low-frequency and low-/high-frequency spectrum were less when breathing N2O than when breathing air. 3. These observations are consistent with the effect of N2O being an enhanced sympathetic balance of sinoatrial control, with the primary effect being through reduced parasympathetic tone. Enhanced sympathetic dominance of heart rate variability was seen on standing while subjects breathed air, but this effect was blunted with N2O.

A Newly Designed 650kv Electron Microscope

1968 ◽  
Vol 26 ◽  
pp. 304-305
Author(s):  
K. Shiraishi ◽  
T. Katsuta ◽  
S. Ozasa ◽  
H. Todokoro
Keyword(s):  
Electron Microscope ◽  
High Voltage ◽  
Bright Field Image ◽  
Bright Field ◽  
Push Button ◽  
Condenser Lens ◽  
High Voltage Generator ◽  
Frequency Power ◽  
Better Than ◽  
Illuminating System

We have recently completed a newly designed 650KV electron microscope. An external view of this advanced instrument is shown in Figure 1. A symmetrical Cockcroft-Walton circuit has been adopted as the high voltage generator. The cathode is heated by high frequency power; a battery is not employed. The high voltage stability is better than 1 x 10-5/min.The sectional diagram of the column shown in Figure 2 is 420mm in diameter and 2750mm in height. The illuminating system consists of a double condenser lens and a magnetic alignment device. Dual deflector assemblies for dark and bright field images, selectable by push button, are built beneath the condenser lens. Two selectable stigmator power supplies are also provided for dark and bright field image operation.

Simulations of high-resolution images of amorphous silicon films

1986 ◽  
Vol 44 ◽  
pp. 544-545
Author(s):  
G. Y. Fan ◽  
J. M. Cowley
Keyword(s):  
Electron Microscope ◽  
High Frequency ◽  
Fourier Transformation ◽  
Amorphous Materials ◽  
Low Frequency ◽  
Chromatic Aberration ◽  
Structure Information ◽  
Frequency Components ◽  
High Resolution Images ◽  
Spatial Frequency Spectrum

It is well known that the structure information on the specimen is not always faithfully transferred through the electron microscope. Firstly, the spatial frequency spectrum is modulated by the transfer function (TF) at the focal plane. Secondly, the spectrum suffers high frequency cut-off by the aperture (or effectively damping terms such as chromatic aberration). While these do not have essential effect on imaging crystal periodicity as long as the low order Bragg spots are inside the aperture, although the contrast may be reversed, they may change the appearance of images of amorphous materials completely. Because the spectrum of amorphous materials is continuous, modulation of it emphasizes some components while weakening others. Especially the cut-off of high frequency components, which contribute to amorphous image just as strongly as low frequency components can have a fundamental effect. This can be illustrated through computer simulation. Imaging of a whitenoise object with an electron microscope without TF limitation gives Fig. 1a, which is obtained by Fourier transformation of a constant amplitude combined with random phases generated by computer.

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