On the Periodic Fluctuations of Alpha Waves

Mimura, Keiichi

doi:10.2170/jjphysiol.21.375

Cited by 14 publications

(35 citation statements)

References 17 publications

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“…It has been reported that the specific and nonspecific evoked potentials show periodic fluctuations in their amplitudes (TOMAN, 1945;BREMER, 1949;JASPER, 1949;MORUZZI et al, 1950;ARDUINI and TERZUOLO, 1951;CHANG, 1952;LI and JASPER, 1953). On the other hand, my previous paper (MIMURA, 1971) suggested some excitability rhythms in the cortex which are expressed in several types of fluctuations in the amplitude of the alpha wave. The periodic fluctuations, whether expressed in EEG or in evoked potentials, are thought to reflect common excitability changes in the brain, in view of the discovery of a component common to both EEG and evoked potentials (BISHOP and CLARE, 1952;MIMURA, 1969).…”

Section: Discussionmentioning

confidence: 96%

“…The procedures used to analyze the types of periodic fluctuations were the same as described in my preceding paper (MIMURA, 1971). The amplitudes of the evoked potential produced by 1/sec stimulation were plotted against time, and a smoothed curve was obtained by the method of moving averages.…”

Section: The Four Types Of Periodic Fluctuations In the Evoked Potentialmentioning

confidence: 99%

“…Type IV fluctuation was a local activity in each portion of the brain and had a closer relationship within the specific system, rather than within the nonspecific one, as compared with other types. Four types of periodic fluctuations have been noted in the amplitude of alpha waves in the human cerebral cortex (MIMURA, 1971). It has been suggested that these fluctuations may be related to the excitability changes that are specific to the brain.…”

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confidence: 99%

“…It has been suggested that these fluctuations may be related to the excitability changes that are specific to the brain. Although fluctuations have also been demonstrated in the photically driven EEG waves of man (TREHUB, 1965;MIMURA, 1971) and in the evoked potentials of cat (CHANG, 1952), descriptions of only one or two types are given in the reports of TREHUB and CHANG. Using the analytic method described in my preceding paper (MIMURA, 1971), an attempt was made in the present study to obtain detailed information regarding each type of periodic fluctuation in the cortical and subcortical structures.…”

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confidence: 99%

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Periodic Fluctuations of Photicahlly Evoked Potentials in the Cat Brain

Mimura

1971

Jpn.J.Physiol

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Section: Discussionmentioning

confidence: 96%

Section: The Four Types Of Periodic Fluctuations In the Evoked Potentialmentioning

confidence: 99%

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Periodic Fluctuations of Photicahlly Evoked Potentials in the Cat Brain

Mimura

1971

Jpn.J.Physiol

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“…Amplitude fluctuations occur across multiple timescales, a distinctive feature of alpha oscillations known as "waxing and waning" [41,40]. They show non-trivial features, such as long-range temporal correlations (LRTC) [27,43] and non-Gaussian bimodal distributions of power [19], suggesting the existence of two distinct modes-higher-and lower-power modes [19].…”

Section: Introductionmentioning

confidence: 99%

Beyond pulsed inhibition: Alpha oscillations modulate attenuation and amplification of neural activity in the awake resting-state

Lombardi¹,

Herrmann

Parrino

et al. 2022

Preprint

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Rhythmical cortical activity has long been recognized as a pillar in the architecture of brain functions. Yet, the dynamic organization of its underlying neuronal population activity remains elusive. Here we uncover a unique organizational principle regulating collective neural dynamics associated with the alpha rhythm in the awake resting-state. We demonstrate that cascades of neural activity obey attenuation-amplification dynamics (AAD), with a transition from the attenuation regime—within alpha cycles—to the amplification regime—across a few alpha cycles—that correlates with the characteristic frequency of the alpha rhythm. We find that this short-term AAD is part of a large-scale, size-dependent temporal structure of neural cascades that obeys the Omori law: Following large cascades, smaller cascades occur at a rate that decays as a power-law of the time elapsed from such events—a long-term AAD regulating brain activity over the timescale of seconds. We show that such an organization corresponds to the “waxing and waning” of the alpha rhythm. Importantly, we observe that short- and long-term AAD are unique to the awake resting-state, being absent during NREM sleep. These results provide a quantitative, dynamical description of the so-far-qualitative notion of the “waxing and waning” phenomenon, and suggest the AAD as a key principle governing resting-state dynamics across timescales.

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