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Related Experiment Video

Updated: May 22, 2026

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

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Magnetoencephalography with a chip-scale atomic magnetometer.

T H Sander, J Preusser, R Mhaskar

Biomedical Optics Express

|May 9, 2012

Summary

This summary is machine-generated.

Chip-scale atomic magnetometers (CSAMs) measured brain activity using magnetoencephalography (MEG). These compact sensors detected spontaneous alpha oscillations and somatosensory-evoked fields, demonstrating potential for portable neuroscience.

Keywords:

(120.0120) Instrumentation, measurement, and metrology (170.0170) Medical optics and biotechnology (230.0230) Optical devices

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Studying Brain Function in Children Using Magnetoencephalography

Studying Brain Function in Children Using Magnetoencephalography

Published on: April 8, 2019

Area of Science:

Biophysics
Neuroscience
Atomic Physics

Background:

Magnetoencephalography (MEG) traditionally requires bulky, cryogenically cooled sensors.
There is a need for more portable and accessible neuroimaging technologies.
Chip-scale atomic magnetometers (CSAMs) offer a potential solution due to their small size and uncooled operation.

Purpose of the Study:

To measure spontaneous and somatosensory-evoked magnetoencephalography (MEG) signals using a chip-scale atomic magnetometer (CSAM).
To evaluate the feasibility of using CSAMs for human brain activity monitoring.
To assess the performance of a compact, fiber-coupled CSAM in a real-world neuroimaging scenario.

Main Methods:

Utilized a chip-scale atomic magnetometer (CSAM) based on optical spectroscopy of alkali atoms.
The uncooled, fiber-coupled CSAM featured a small sensitive volume (0.77 mm³) and sensor head (1 cm³).
Recorded spontaneous brain activity (alpha oscillations) over O1 and somatosensory-evoked fields over C3 in a healthy human subject via right wrist stimulation.

Main Results:

Observed alpha oscillations in the magnetic field component perpendicular to the scalp surface over O1.
Successfully measured somatosensory-evoked fields over C3 following peripheral nerve stimulation.
Higher noise levels of the CSAM were offset by increased signal amplitude due to proximity to the scalp.

Conclusions:

Demonstrated the capability of a compact CSAM to measure human brain activity, including spontaneous and evoked MEG signals.
The convenient handling and small form factor of the CSAM are comparable to electroencephalography (EEG) electrodes.
CSAMs show promise as a portable and potentially more accessible alternative for neuroimaging applications.