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Recording brain activities in unshielded Earth’s field with optically pumped atomic magnetometers
- Source :
- Science Advances
- Publication Year :
- 2020
- Publisher :
- American Association for the Advancement of Science (AAAS), 2020.
-
Abstract
- High-sensitivity total-field atomic magnetometer enables brain-activity measurements in unshielded Earth’s field.<br />Understanding the relationship between brain activity and specific mental function is important for medical diagnosis of brain symptoms, such as epilepsy. Magnetoencephalography (MEG), which uses an array of high-sensitivity magnetometers to record magnetic field signals generated from neural currents occurring naturally in the brain, is a noninvasive method for locating the brain activities. The MEG is normally performed in a magnetically shielded room. Here, we introduce an unshielded MEG system based on optically pumped atomic magnetometers. We build an atomic magnetic gradiometer, together with feedback methods, to reduce the environment magnetic field noise. We successfully observe the alpha rhythm signals related to closed eyes and clear auditory evoked field signals in unshielded Earth’s field. Combined with improvements in the miniaturization of the atomic magnetometer, our method is promising to realize a practical wearable and movable unshielded MEG system and bring new insights into medical diagnosis of brain symptoms.
- Subjects :
- Auditory evoked field
Magnetometer
Acoustics
02 engineering and technology
law.invention
03 medical and health sciences
0302 clinical medicine
law
Shielded cable
medicine
Miniaturization
Research Articles
Applied Physics
Physics
Multidisciplinary
medicine.diagnostic_test
Noise (signal processing)
SciAdv r-articles
Magnetoencephalography
equipment and supplies
021001 nanoscience & nanotechnology
Gradiometer
Magnetic field
0210 nano-technology
030217 neurology & neurosurgery
Research Article
Subjects
Details
- ISSN :
- 23752548
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Science Advances
- Accession number :
- edsair.doi.dedup.....2da5f2c3d484bae2811c91cb522239a2