Cited by 102Atomic and Subatomic Physics ResearchAdvanced MRI Techniques and ApplicationsEEG and Brain-Computer Interfaces

Using OPMs to measure neural activity in standing, mobile participants

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Seymour, Robert A., Alexander, Nicholas, Mellor, Stephanie, O'Neill, George C., Tierney, Tim M., Barnes, Gareth R., Maguire, Eleanor A.·2021·NeuroImage

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Abstract

Optically pumped magnetometer-based magnetoencephalography (OP-MEG) can be used to measure neuromagnetic fields while participants move in a magnetically shielded room. Head movements in previous OP-MEG studies have been up to 20 cm translation and ∼30° rotation in a sitting position. While this represents a step-change over stationary MEG systems, naturalistic head movement is likely to exceed these limits, particularly when participants are standing up. In this proof-of-concept study, we sought to push the movement limits of OP-MEG even further. Using a 90 channel (45-sensor) whole-head OP-MEG system and concurrent motion capture, we recorded auditory evoked fields while participants were: (i) sitting still, (ii) standing up and still, and (iii) standing up and making large natural head movements continuously throughout the recording - maximum translation 120 cm, maximum rotation 198°. Following pre-processing, movement artefacts were substantially reduced but not eliminated. However, upon utilisation of a beamformer, the M100 event-related field localised to primary auditory regions. Furthermore, the event-related fields from auditory cortex were remarkably consistent across the three conditions. These results suggest that a wide range of movement is possible with current OP-MEG systems. This in turn underscores the exciting potential of OP-MEG for recording neural activity during naturalistic paradigms that involve movement (e.g. navigation), and for scanning populations who are difficult to study with stationary MEG (e.g. young children).

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  • The lightweight nature of OPMs has enabled wearable systems that allow participants to move during recordings.

    “In addition, the lightweight nature of OPMs has enabled the development of wearable systems which allow participants to move during recordings [24,28,29,30]”

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Authors
Seymour, R. A., Alexander, N., Mellor, S., O'Neill, G. C., Tierney, T. M., Barnes, G. R., & Maguire, E. A.
Affiliations
Wellcome Centre for Human Neuroimaging (GB)
Corresponding author
  • Seymour, Robert A.
  • Maguire, Eleanor A.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2021-12
Volume
244
Pages
118604
ISSN
1053-8119 (ISSN-L)
OpenAlex
W3200893299
Cited by
102
References
65
Citations by year
2026: 16 · 2025: 27 · 2024: 19 · 2023: 19 · 2022: 18 · 2021: 3
FWCI
6.44
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Wellcome Trust
  • University of Nottingham
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Atomic and Subatomic Physics Research
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
Keywords
optically pumped magnetometers, magnetoencephalography, head movement, standing up, motion artifacts, auditory evoked magnetic fields, M100, primary auditory cortex, beamforming, motion capture, naturalistic paradigm
MeSH terms
Proof of Concept Study, Standing Position, Adult, Auditory Cortex, Evoked Potentials, Auditory, Head, Humans, Male, Rotation, Magnetoencephalography, Artifacts, Head Movements

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