Diurnal Alterations of Brain Electrical Activity in Healthy Adults: A LORETA Study

Tóth, Márton; Kiss, Attila; Kosztolányi, Péter; Kondákor, István

doi:10.1007/s10548-007-0032-3

Cited by 25 publications

(20 citation statements)

References 50 publications

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“…EEGs were recorded between 8:00 and 10:00 in the morning (Toth et al 2007). A 22-ch EEG recording, using Ag/AgCl electrodes and two channels electro-oculogram (EOG) were continuously gathered for 2 min in the period of the experiment, respectively with the A.N.T.…”

Section: Eeg Recordingsmentioning

confidence: 99%

The Impact of a Regular Blood Donation on the Hematology and EEG of Healthy Young Male Blood Donors

Zhang

Zhang²,

Yang

et al. 2011

Brain Topogr

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The aim of this study was to investigate the effect of 400 ml whole blood donation on the human electroencephalogram (EEG) and hematology, not earlier reported in the literature. EEG activity was recorded from ten male blood donors (experiment group) before, during and after blood donation (i.e., 400 ml whole blood withdrawal). EEG topography and regional spectral field powers analyses were carried out via fast Fourier transformation. The venous hemoglobin (Hb) concentration was measured with a hematology analyzer. In the control investigation, 12 male age-matched volunteers (control group) were kept in semi-sitting position for the duration of a blood donation without actually vena puncture. The volunteers had no prior experiences of blood donation. Within the experiment group, post-donation Hb concentration decreased by 3.7% compared with the pre-donation Hb values (P < 0.01). Before blood donation, Hb concentration in control group was significantly higher compared to the experiment group (P < 0.05). For the experiment group, the field power of alpha-1 (7.5-9.5 Hz) EEG during blood withdrawal was significantly lower compared to that after blood withdrawal (P < 0.05). In contrast for the control group, all seven bands of regional spectral field powers showed no significantly discrepancies in the three periods. Blood donation attenuates the alpha-1 at the parietal-frontal area on human EEG-DMN transiently with no lasting effect at post-donation period. The blood donation-related effects on brain function may be of little consequence due to slight hemodynamic change and the results may facilitate the opinion that blood donation is a safe process and that should not discourage volunteers.

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Section: Eeg Recordingsmentioning

confidence: 99%

The Impact of a Regular Blood Donation on the Hematology and EEG of Healthy Young Male Blood Donors

Zhang

Zhang²,

Yang

et al. 2011

Brain Topogr

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“…Overall, the patients were treated and followed as usual. Healthy persons were recruited at the Department of Neurology, University of Pécs, under the approval of that Local Ethics Committee (Toth et al, 2007).…”

Section: Patients Healthy Control Persons and Methodsmentioning

confidence: 99%

“…In order to estimate the topographic distribution of theta activity in healthy persons, the 6.5 to 8 Hz averaged absolute (raw) LORETA results of 14 healthy persons were given. These data came from a prior study where they had not been explicitly published (Toth et al, 2007).…”

Section: Loreta Analysismentioning

confidence: 99%

Theta EEG source localization using LORETA in partial epilepsy patients with and without medication

Clemens

Bessenyei

Fekete

et al. 2010

Clinical Neurophysiology

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Objective. To investigate and localize the sources of spontaneous, scalp-recorded theta activity in patients with partial epilepsy (PE).Methods. 9 patients with beginning, untreated PE (Group1), 31 patients with already treated PE (Group2), and 14 healthy persons were investigated by means of spectral analysis and LORETA, low resolution electromagnetic tomography (1 Hz very narrow band analysis, age-adjusted, Z-scored values). The frequency of main interest was 4 to 8 Hz Results. Group analysis. Group1 displayed bilateral theta maxima in the temporal theta area (TTA), parietal theta area (PTA), and frontal theta area (FTA). In Group2, theta activity increased all over the scalp as compared to the normative mean (Z=0) and also to Group1. Maximum activity was found in the TTA, PTA, and FTA. However, in the PTA and FTA the centers of the abnormality shifted towards the medial cortex. Individual analysis: all the patients showed preferential activation (maximum Zvalues) within one of the three theta areas. 2Conclusion. EEG activity in the theta band is increased in anatomically meaningful patterns in PE patients, which differs from the anatomical distribution of theta in healthy persons.Significance. The findings contribute to our understanding of the sources of theta rhythms and the pathophysiology of PE.

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“…There is reasonable evidence that resting-state power in the beta frequency band is weakest in the morning hours and that it increases during the late afternoon in healthy adults (Cacot et al, 1995; Gundel et al, 1983; Toth et al, 2007). There is also abundant evidence that motor performance is influenced by the biological clock (Carrier and Monk, 2000; Drust et al, 2005; Gueugneau and Papaxathis, 2010; Jasper et al, 2009), and a recent fMRI study of finger-tapping showed that time-of-day effects could be discerned in multiple motor regions (Peres et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Circadian modulation of motor-related beta oscillatory responses

Wilson

Heinrichs‐Graham

Becker³

2014

NeuroImage

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Previous electrophysiological investigations have evaluated movement-related beta (14–28 Hz) oscillatory activity in healthy participants. These studies have described an abrupt decrease in beta activity that starts before movement onset, and a sharp increase in beta power that peaks after movement termination. These neural responses have been respectively termed the event-related beta desynchronization or pre-movement beta ERD, and the post-movement beta rebound (PMBR). Previous studies have shown that a variety of movement parameters and demographic factors (e.g., age) modulate the amplitude of these oscillatory responses, and in the current study we evaluated whether the amplitudes follow a biological temporal rhythm (e.g., circadian), as it is known that spontaneous beta levels increase from morning to afternoon in some brain areas. To this end, we used magnetoencephalography (MEG) to evaluate oscillatory activity during a right hand finger-tapping task in four participants who were recorded at three different times (09:00, 12:00, 16:00) on three consecutive days (i.e., 36 total MEG sessions). All MEG data were corrected for head motion and examined in the time-frequency domain using beamforming methods. We found a significant linear increase in beta ERD amplitude from 09:00 to 16:00 hours in the left precentral gyrus, left premotor cortices, left supplementary motor area (SMA), and the right precentral and postcentral gyri. In contrast, the amplitude of the PMBR was very steady across the day in all brain regions except the left SMA, which exhibited a linear increase from morning to afternoon. Finally, beta levels during the baseline period also increased from 09:00 to 16:00 in most regions of the cortical sensorimotor network. These data show that both the pre-movement beta ERD and spontaneous beta levels strongly increase from morning to afternoon in the motor cortices, which may indicate that the amplitude of the beta ERD response is determined by the spontaneous beta level during the motor planning period.

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Diurnal Alterations of Brain Electrical Activity in Healthy Adults: A LORETA Study

Cited by 25 publications

References 50 publications

The Impact of a Regular Blood Donation on the Hematology and EEG of Healthy Young Male Blood Donors

The Impact of a Regular Blood Donation on the Hematology and EEG of Healthy Young Male Blood Donors

Theta EEG source localization using LORETA in partial epilepsy patients with and without medication

Circadian modulation of motor-related beta oscillatory responses

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