Physiological basis of the alpha rhythm

  • 3.55 MB
  • English
Appleton-Century-Crofts , New York
StatementPer Andersen [and] Sven A. Andersson.
ContributionsAndersson, Sven A.
ID Numbers
Open LibraryOL19741740M

Physiological Basis of the Alpha Rhythm by Per Andersen (Author) ISBN ISBN Why is ISBN important. ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. The digit and digit formats both by: Alpha rhythm: Additional Physical Format: Online version: Andersen, Per.

Physiological basis of the alpha rhythm. New York, Appleton-Century-Crofts [] (OCoLC) Document Type: Book: All Authors / Contributors: Per Andersen; Sven A Andersson. To the author's knowledge this book is the first to review the whole field of the Alpha rhythm component of the electroencephalogram (EEG).

It reviews the classical studies from the s through the s when EEG research became dominated by event-related potential studies. Renewed interest in the alpha rhythm developed in the s when neuronal oscillations became a major focus of interest.

Author(s): Andersen,Per; Andersson,Sven A(Sven Anders), Title(s): Physiological basis of the alpha rhythm [by] Per Andersen [and] Sven A.


Details Physiological basis of the alpha rhythm FB2

Country of Publication: United States Publisher: [New York, Appleton-Century-Crofts, c] Description: vii, p. illus. Language: English LCCN: MeSH: Brain/physiology*; Electroencephalography* NLM ID: [Book].

Abstract There are three physiological alpha rhythms in mature healthy humans: (a) the classical posterior alpha; (b) the Rolandic mu rhythm and (c) the midtemporal `third rhythm'.

The classical posterior alpha rhythm develops out of a 4/s rhythm appearing at age 4 months and gradually reaches the alpha frequency band around age 3 by:   Using rare intracranial recordings in epilepsy patients, we find that alpha rhythms Physiological basis of the alpha rhythm book toward the back of the brain and that alpha waves in cortex (particularly superficial layers) lead alpha oscillations in the thalamus.

These findings shed light on how the human alpha rhythm coordinates activity throughout the brain. The alpha rhythm dominates the electroencephalogram.

Physiological Basis Alpha Rhythm Paradoxical Sleep Gamma Rhythm Beta Rhythm These keywords were added by machine and not by the authors. This process is experimental and the keywords may be Physiological basis of the alpha rhythm book as the learning algorithm improves.

The alpha rhythm (Fig. ), is one of the most prominent normal adult brain rhythms and is identified by its frequency, spatial topography, behavioral correlates, and reactivity to stimuli. 17–22 The alpha rhythm is fully present only when a subject is mentally inactive, yet alert, with eyes closed.

Methods The resting EEG spectrum of beta ( Hz), alpha ( Hz), theta ( Hz) and delta ( Hz) rhythm were measured in 32 patients undertaking chronic MMT, 17 opiate users and A 10 Hz rhythm is present in the occipital cortex when the eyes are closed (alpha waves), in the precentral cortex at rest (mu rhythm), in the superior temporal lobe (tau rhythm), in the inferior olive (projection to the cerebellar cortex), and in physiological tremor (underlying all voluntary movement).

This rhythm is the “idle” or “resting” speed of the waking brain, which is replaced (not “blocked” or. and therefore can be a powerful instrument for exploring the biological basis of intel- ligence.

However, the question of whether the EEG, and, in particular, the alpha rhythm frequency (AF) is related to intelligence in normal adults remained unclear. We analyzed EEG spectra and performance on different intelligence tests in healthy males.

Rather, they reveal the occurrence of an alpha-wave synchronization in the EEG of one subject that is precisely timed to the R-wave of the other subject’s ECG. Power-spectrum analysis of the signal-averaged EEG waveforms showed that the alpha rhythm was synchronized to the other person’s heart.

Alpha frequency can also be calculated in terms of gravity (or `mean') frequency which is the weighted sum of spectral estimates, divided by alpha power: (∑ (a (f)× f))/ (∑ a (f)). Power spectral estimates at frequency f are denoted a (f). The index of summation is in the range of f 1 to f 2.

Hans Berger (21 May – 1 June ) was a German psychiatrist. He is best known as the inventor of electroencephalography (EEG) inwhich is a method used for recording the electrical activity of the brain, commonly described in terms of brainwaves, and as the discoverer of the alpha wave rhythm which is a type of brainwave.

Alpha waves have been eponymously referred to as the. Alpha waves are the primary rhythm observed in relaxed adults and are present during most of life after 13 years old.

Each region of the brain has a characteristic Alpha rhythm amplitude and the largest Alpha waves are from the occipital and parietal regions of the cerebral cortex.

Alpha rhythms correlate with inhibitory processes in the brain. Correction for pulse height variability reduces physiological noise in functional MRI when studying spontaneous brain activity. Petra J.

van Houdt. which is also the basis of fMRI. We derived a regressor from the variation in pulse height (VIPH) of PPG and added this regressor to the GLM. when studying the generators of the alpha rhythm. This book discusses in depth all aspects of EEG-fMRI, including physiological principles and technical and methodological issues such as EEG artefact reduction methods, image quality, and data.

Several aspects of perception, particularly those pertaining to vision, are closely linked to the occipital alpha (α) rhythm. However, how the α rhythm relates to the activity of neurons that convey primary visual information is unknown.

Here we show that in behaving cats, thalamocortical neurons in the lateral geniculate nucleus (LGN) that operate in a conventional relay-mode form two groups where. Book Reviews and the chapters dealing with the spinal cord are likely to be a lasting con- tribution to the literature of neurophysiology.

For years it has been evident that techniquesfor investigating the electrical responses ofthe nervous system left something to be desired, for, whilst it was possible to describe responses measured in milliseconds, changes of longer duration were not adequately. Part of the Springer Series in Computational Neuroscience book series (NEUROSCI, Thus rather than the “alpha rhythm” being an idling rhythm it may be more profitable to conceive it as a readiness rhythm.

Andersen, P., Andersson, S.A.: Physiological basis of the alpha rhythm.

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Appelton-Century-Crofts, New York Y(). Because different types of adaptation can occur, periodization of strength offers a seven-phase approach that follows the physiological rhythm of the neuromuscular system's response to strength training. The seven phases are anatomical adaptation, hypertrophy, maximum strength, conversion, maintenance, cessation, and compensation.

Alpha rhythm is defined as 8–Hz sinusoidal rhythmical waves. Alpha waves are normally present during the waking and relaxed state and enhanced by closing the eyes. They are suppressed or desynchronized when the eyes are open, or when the individual is emotionally aroused or.

Respiratory sinus arrhythmia (RSA) is heart rate variability in synchrony with respiration, by which the R-R interval on an ECG is shortened during inspiration and prolonged during expiration.

Although RSA has been used as an index of cardiac vagal function, it is also a physiologic phenomenon refle. Other articles where Alpha wave is discussed: human behaviour: Central nervous system processing: The dominant rhythm is the alpha wave, which reaches its maximum frequency in adolescence and begins to slow gradually after young adulthood.

This slowing may be related to disease processes (particularly vascular disease) and to basic aging processes. Field potential oscillations in the ~10 Hz range are known as the alpha rhythm.

The genesis and function of alpha has been the subject of intense investigation for the past 80 years. Whereas early work focused on the thalamus as the pacemaker of alpha rhythm, subsequent slice studies revealed that pyramidal neurons in the deep layers of sensory cortices are capable of.

Alpha waves are neural oscillations in the frequency range of 8–12 Hz likely originating from the synchronous and coherent (in phase or constructive) electrical activity of thalamic pacemaker cells in humans. Historically, they are also called "Berger's waves" after Hans Berger, the inventor of EEG.

Alpha waves are one type of brain waves detected by electrophysiological and closely related. Rhythm is the beat and pace of a poem and is created by the pattern of stressed and unstressed syllables.

It helps in strengthening the meaning and ideas of the poem.

Description Physiological basis of the alpha rhythm FB2

It lies between a certain range of regularity, of specific language features of sound. It is readily discriminated by the ear and the mind, having as it works on a physiological.

These results confirm animal studies (Lopes da Silva and Storm van Leeuwen, ; Steriade et al., ) reporting two different components in the generation of the alpha rhythm: the rhythmic thalamic activity and a cortico-cortical component that contributes to the generation of a cortical domain of alpha and its propagation over the cortex.

Positive correlation of BOLD in the thalami could be explained by the rhythmic. Physiology (/ ˌ f ɪ z i ˈ ɒ l ə dʒ i /; from Ancient Greek φύσις (physis) 'nature, origin', and -λογία (-logia) 'study of') is the scientific study of functions and mechanisms in a living system.

As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemical and physical functions in a living. Circadian rhythm. Circadian rhythms occur in 24 hour cycles.

The circadian rhythm prompts sleep at night and also to small extent between 2 and 4 pm. Usually the sleep, temperature and hormonal circadian rhythms are synchronised so that all of these factors.

Our CSD analysis of the ongoing alpha rhythm revealed sinks in the granular layer, co-occurring with sources in the infragranular layers (Figure 4B,D). While it is difficult to pinpoint the precise basis for this pattern, one possibility would be that the zero-lag source is an active source corresponding to after-hyperpolarization currents in layer 5 (L5) cells [ 31 ].

Physiological basis of galvanic. has characteristic alpha rhythm but alpha waves of. greatest amplitude are recorded from the occipital. and parietal regions of cerebral cortex. Meditation.The Physiology of Meditation by Dr. Jooyoung Julia Shin, M.D. Introduction Eastern religious and secular groups, such as the Buddhists, Taoists, and the Indian Yogis have practiced meditation throughout history in order to achieve certain mental and physical ends; these include muscular relaxation and "clearing" the mind, as well as the more esoteric union with nature or God.