EEG inter/intra-hemispheric coherence and asymmetric responses to visual stimulations

Cvetković, Dean; Cosic, Irena

doi:10.1007/s11517-009-0499-z

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…This was evaluated by applying the improved experimental protocol and objective using a non-parametric spectral estimation coherence algorithm. The findings from our study revealed a significantly higher coherence in the EEG beta2 band (16.6 Hz) corresponding to 16.66 Hz visual stimulation, suggesting a high inter-hemispheric functional connectivity during visual stimulus (Cvetkovic & Cosic, 2009). A significant increase was revealed during 50 Hz visual stimulation at gamma band and a decrease during 4 Hz visual stimulation at theta band, linked with a substantial transitional shift in predominance from anterior to posterior relative power.…”

Section: Discussionsupporting

confidence: 51%

Preliminary evaluation of electroencephalographic entrainment using thalamocortical modelling

2009

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The concept of linked oscillators in biological control systems has long been established. Frequency entrainment is a predominant explanation behind many biological rhythms. In this paper a preliminary examination of electroencephalographic entrainment is made to survey the possibility and methods of achieving signal entrainment at the highest level of neurological organization and function. A model of the thalamocortical system is employed to generate simulated electroencephalographic signals and is tested in various configurations in the search for entrainment under very simple conditions. Additionally, an analysis of the coupled Van der Pol model of the circadian rhythm controller is performed to identify the possibility of affecting that system with a drastically different coupling input signal. We were able to conclude that overall signal shape can have a significant impact on the entrainment characteristics of the system. Due to the nature of the underlying mathematical structure of the model, by examining the circadian rhythm controller, we found that it is unsuitable for entrainment to an incident entraining signal of much higher frequency.

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Section: Discussionsupporting

confidence: 51%

Preliminary evaluation of electroencephalographic entrainment using thalamocortical modelling

2009

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“…This type of EEG synchronisation of driving alpha and beta EEG by alpha and beta sinusoidal MF stimulation, demonstrated in this study, could possibly be applied as therapeutic treatment(s) of particular neurophysiological abnormalities such as sleep and psychiatric disorders. In future, authors expect that the EEG synchronisation can effectively be demonstrated by either flickering of lights [10] and/or MF at ELF.…”

Section: Resultsmentioning

confidence: 99%

Alterations of human electroencephalographic activity caused by multiple extremely low frequency magnetic field exposures

Cvetković

Cosic

2009

Med Biol Eng Comput

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In the past, many studies have claimed that extremely low frequency (ELF) magnetic field (MF) exposures could alter the human electroencephalographic (EEG) activity. This study aims at extending our ELF pilot study to investigate whether MF exposures at ELF in series from 50, 16.66, 13, 10, 8.33 to 4 Hz could alter relative power within the corresponding EEG bands. 33 human subjects were tested under a double-blind and counter-balanced conditions. The multiple repeated three-way analysis of variance (ANOVA) mixed design (within and between-subject) analysis was employed followed by post-hoc t-tests and Bonferroni alpha-correction. The results from this study have shown that narrow alpha1 (7.5-9.5 Hz) and alpha2 (9-11 Hz) bands, associated with 8.33 and 10 Hz MF exposures, were significantly (p < 0.0005) lower than control over the temporal and parietal regions within the 10-16 min of first MF exposure session and the MF exposures were significantly higher than control of the second session MF exposure (60-65 min from the commencement of testing). Also, it was found that the beta1 (12-14 Hz) band exhibited a significant increase from before to after 13-Hz first MF exposure session at frontal region. The final outcome of our result has shown that it is possible to alter the human EEG activity of alpha and beta bands when exposed to MF at frequencies corresponding to those same bands, depending on the order and period of MF conditions. This type of EEG synchronisation of driving alpha and beta EEG by alpha and beta sinusoidal MF stimulation, demonstrated in this study, could possibly be applied as therapeutic treatment(s) of particular neurophysiological abnormalities such as sleep and psychiatric disorders.

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“…where, 𝐶𝑜ℎ 𝑥𝑦 𝑖𝑠 estimated coherence value in the range of 0-1 [33], f is frequency, 𝑊 𝑥 (𝑓) is the PSD of signal 𝑥, 𝑊 𝑦 (𝑓) is the PSD of signal 𝑦 and 𝑊 𝑥𝑦 (𝑓) is cross spectral density between the two brain region. If the coherence value approaches=1, it means that the x and y signals are similar.…”

Section: Eeg Coherencementioning

confidence: 99%

Comparison of resting electroencephalogram coherence in patients with mild cognitive impairment and normal elderly subjects

Hadiyoso

Wijayanto

Aulia

2022

IJECE

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Mild cognitive impairment (MCI) was a condition beginning before more serious deterioration, leading to Alzheimer’s dementia (AD). MCI detection was needed to determine the patient's therapeutic management. Analysis of electroencephalogram (EEG) coherence is one of the modalities for MCI detection. Therefore, this study investigated the inter and intra-hemispheric coherence over 16 EEG channels in the frequency range of 1-30 Hz. The simulation results showed that most of the electrode pair coherence in MCI patients have decreased compared to normal elderly subjects. In inter hemisphere coherence, significant differences (p<0.05) were found in the FP1-FP2 electrode pairs. Meanwhile, significant differences (p<0.05) were found in almost all pre-frontal area connectivity of the intra-hemisphere coherence pairs. The electrode pairs were FP2-F4, FP2-T4, FP1-F3, FP1-F7, FP1-C3, FP1-T3, FP1-P3, FP1-T5, FP1-O1, F3-O1, and T3-T5. The decreased coherence in MCI patients showed the disconnection of cortical connections as a result of the death of the neurons. Furthermore, the coherence value can be used as a multimodal feature in normal elderly subjects and MCI. It is hoped that current studies may be considered for early detection of Alzheimer’s in a larger population.

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EEG inter/intra-hemispheric coherence and asymmetric responses to visual stimulations

Cited by 12 publications

References 40 publications

Preliminary evaluation of electroencephalographic entrainment using thalamocortical modelling

Preliminary evaluation of electroencephalographic entrainment using thalamocortical modelling

Alterations of human electroencephalographic activity caused by multiple extremely low frequency magnetic field exposures

Comparison of resting electroencephalogram coherence in patients with mild cognitive impairment and normal elderly subjects

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