Human exposure to power frequency magnetic fields up to 7.6 mT: An integrated EEG/fMRI study

Modolo, Julien; Thomas, Alex; Legros, Alexandre

doi:10.1002/bem.22064

Cited by 5 publications

(2 citation statements)

References 26 publications

(48 reference statements)

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“…They also found that theta increased in on reward signal 38 . In Julien Modolo et al, study, alpha remains unchanged at the occipital region in magnetic frequency (60 Hz) stressor 39 .…”

Section: Resultsmentioning

confidence: 88%

A review of the literature on the impact of acute and chronic stress upon brain waves

Noushad

Ahmed

Ansari

et al. 2021

Ann. psychophysiol.

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Background: The biological responses associated with stress originate in the brain and involve different physiological and physical effects. The direct effect of stress on cortical responses can be visualized by recording the brain’s electrical waves using an encephalograph. These waves are recorded by means of an electroencephalogram (EEG). EEG is the most commonly used neuroimaging technique to study the patterns of brainwaves and functioning of the brain. It also measures the variation of the electric field produced by neuronal activity a millisecond at a time. To systematically analyze published studies on the difference between brain wave patterns in terms of their frequencies among subjects with acute stress, chronic stress, and normal individuals. Methodology: The data from published studies was arranged quantitatively and qualitatively by producing a planned summary measure. Studies that focused on brain wave analysis of the EEG of healthy adult subjects with no history of mental illness or head injury were included in the review. The selected literature included many types of stressors that are acute or chronic, and that affected the neuronal electrical activity. The only electronic database utilized to identify relevant studies was PubMed. Result: Fifteen studies were included that were based on a variety of acute stressors to observe alterations in brain wave activity between stress-free and stressed states. These studies showed that stressors could be a causative factor to generate fluctuations in neuronal oscillations that also leads to significant psychological, physiological and neurobiological deteriorations to some extent. An additional sixteen studies were included, which showed the effect of chronic stress on the asymmetry of the amplitude in the frequencies of brain waves. Conclusion: The most common change observed was in the alpha frequency (8-13Hz), followed by changes in beta waves (13-30 Hz) and theta (4-8Hz). Though, there is not always the same resultant pattern of waves explored with even the same type of stressors due to interpersonal differences in response to a stressful situation.

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“…They also found that theta increased in on reward signal 38 . In Julien Modolo et al, study, alpha remains unchanged at the occipital region in magnetic frequency (60 Hz) stressor 39 .…”

Section: Resultsmentioning

confidence: 88%

A review of the literature on the impact of acute and chronic stress upon brain waves

Noushad

Ahmed

Ansari

et al. 2021

Ann. psychophysiol.

View full text Add to dashboard Cite

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“…Its purpose was to assess the change in perception when patients received more than one MRI examination. The methodology of this questionnaire was based and modified on the study of Modolo et al published in 2017 [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Assessment of the intrasinusidal volume before and after maxillary sinus augmentation using mri – a pilot study of eight patients

Flick,

Smeets,

Gosau

et al. 2024

BMC Oral Health

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Purpose The purpose of this study was to evaluate the suitability, accuracy, and reliability of a non-invasive 3-Tesla magnetic resonance imaging technique (3 T-MRI) for the visualization of maxillary sinus grafts in comparison to conventional, X-ray-based, established standard imaging techniques. Methods A total of eight patients with alveolar bone atrophy who required surgical sinus floor augmentation in the course of dental implantation were included in this pilot study. Alongside pre-operative cone-beam computed tomography (CBCT), 3 T-MRI was performed before and 6 months after sinus floor augmentation. Two investigators measured the maxillary sinus volume preoperatively and after bone augmentation. Results In all cases, MRI demonstrated accurately the volumes of the maxillary sinus grafts. Following surgery, the bony structures suitable for an implant placement increased at an average of 4.89 cm3, corresponding with the decrease of the intrasinusidal volumes. In general, interexaminer discrepancies were low and without statistical significance. Conclusion In this preliminary study, we could demonstrate the feasibility of MRI bone volume measurement as a radiation-free alternative with comparable accuracy to CT/CBCT before procedures like sinus floor augmentation. Nevertheless, costs and artifacts, also present in MRI, have to be taken into account. Larger studies will be necessary to justify the practicability of MRI bone volume evaluation.

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Stimulus effects of extremely low‐frequency electric field exposure on calcium oscillations in a human cortical spheroid

Saito,

Shiina,

Sekiba

2024

Bioelectromagnetics

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High‐intensity, low‐frequency (1 Hz to 100 kHz) electric and magnetic fields (EF and MF) cause electrical excitation of the nervous system via an induced EF (iEF) in living tissue. However, the biological properties and thresholds of stimulus effects on synchronized activity in a three‐dimensional (3D) neuronal network remain uncertain. In this study, we evaluated changes in neuronal network activity during extremely low‐frequency EF (ELF‐EF) exposure by measuring intracellular calcium ([Ca2+]i) oscillations, which reflect neuronal network activity. For ELF‐EF exposure experiments, we used a human cortical spheroid (hCS), a 3D‐cultured neuronal network generated from human induced pluripotent stem cell (hiPSC)‐derived cortical neurons. A 50 Hz sinusoidal ELF‐EF exposure modulated [Ca2+]i oscillations with dependencies on exposure intensity and duration. Based on the experimental setup and results, the iEF distribution inside the hCS was estimated using high‐resolution numerical dosimetry. The numerical estimation revealed threshold values ranging between 255–510 V/m (peak) and 131–261 V/m (average). This indicates that thresholds of neuronal excitation in the hCS were equivalent to those of a thin nerve fiber.

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Human exposure to power frequency magnetic fields up to 7.6 mT: An integrated EEG/fMRI study

Cited by 5 publications

References 26 publications

A review of the literature on the impact of acute and chronic stress upon brain waves

A review of the literature on the impact of acute and chronic stress upon brain waves

Assessment of the intrasinusidal volume before and after maxillary sinus augmentation using mri – a pilot study of eight patients

Stimulus effects of extremely low‐frequency electric field exposure on calcium oscillations in a human cortical spheroid

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