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Global Neuromagnetic Cortical Fields Have Non-Zero Velocity

Alexander, David M ; Nikolaev, Andrey R LU orcid ; Jurica, Peter ; Zvyagintsev, Mikhail ; Mathiak, Klaus and van Leeuwen, Cees (2016) In PLoS ONE 11(3). p.0148413-0148413
Abstract

Globally coherent patterns of phase can be obscured by analysis techniques that aggregate brain activity measures across-trials, whether prior to source localization or for estimating inter-areal coherence. We analyzed, at single-trial level, whole head MEG recorded during an observer-triggered apparent motion task. Episodes of globally coherent activity occurred in the delta, theta, alpha and beta bands of the signal in the form of large-scale waves, which propagated with a variety of velocities. Their mean speed at each frequency band was proportional to temporal frequency, giving a range of 0.06 to 4.0 m/s, from delta to beta. The wave peaks moved over the entire measurement array, during both ongoing activity and task-relevant... (More)

Globally coherent patterns of phase can be obscured by analysis techniques that aggregate brain activity measures across-trials, whether prior to source localization or for estimating inter-areal coherence. We analyzed, at single-trial level, whole head MEG recorded during an observer-triggered apparent motion task. Episodes of globally coherent activity occurred in the delta, theta, alpha and beta bands of the signal in the form of large-scale waves, which propagated with a variety of velocities. Their mean speed at each frequency band was proportional to temporal frequency, giving a range of 0.06 to 4.0 m/s, from delta to beta. The wave peaks moved over the entire measurement array, during both ongoing activity and task-relevant intervals; direction of motion was more predictable during the latter. A large proportion of the cortical signal, measurable at the scalp, exists as large-scale coherent motion. We argue that the distribution of observable phase velocities in MEG is dominated by spatial filtering considerations in combination with group velocity of cortical activity. Traveling waves may index processes involved in global coordination of cortical activity.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Adult, Cerebral Cortex/physiology, Cluster Analysis, Female, Humans, Magnetic Fields, Male, Models, Neurological, Time Factors, Young Adult
in
PLoS ONE
volume
11
issue
3
pages
0148413 - 0148413
publisher
Public Library of Science (PLoS)
external identifiers
  • pmid:26953886
  • scopus:84962218758
ISSN
1932-6203
DOI
10.1371/journal.pone.0148413
language
English
LU publication?
no
id
76ab339a-84be-4e4d-afb8-f4896a7993e1
date added to LUP
2019-10-21 19:29:28
date last changed
2024-05-15 23:13:40
@article{76ab339a-84be-4e4d-afb8-f4896a7993e1,
  abstract     = {{<p>Globally coherent patterns of phase can be obscured by analysis techniques that aggregate brain activity measures across-trials, whether prior to source localization or for estimating inter-areal coherence. We analyzed, at single-trial level, whole head MEG recorded during an observer-triggered apparent motion task. Episodes of globally coherent activity occurred in the delta, theta, alpha and beta bands of the signal in the form of large-scale waves, which propagated with a variety of velocities. Their mean speed at each frequency band was proportional to temporal frequency, giving a range of 0.06 to 4.0 m/s, from delta to beta. The wave peaks moved over the entire measurement array, during both ongoing activity and task-relevant intervals; direction of motion was more predictable during the latter. A large proportion of the cortical signal, measurable at the scalp, exists as large-scale coherent motion. We argue that the distribution of observable phase velocities in MEG is dominated by spatial filtering considerations in combination with group velocity of cortical activity. Traveling waves may index processes involved in global coordination of cortical activity. </p>}},
  author       = {{Alexander, David M and Nikolaev, Andrey R and Jurica, Peter and Zvyagintsev, Mikhail and Mathiak, Klaus and van Leeuwen, Cees}},
  issn         = {{1932-6203}},
  keywords     = {{Adult; Cerebral Cortex/physiology; Cluster Analysis; Female; Humans; Magnetic Fields; Male; Models, Neurological; Time Factors; Young Adult}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{0148413--0148413}},
  publisher    = {{Public Library of Science (PLoS)}},
  series       = {{PLoS ONE}},
  title        = {{Global Neuromagnetic Cortical Fields Have Non-Zero Velocity}},
  url          = {{http://dx.doi.org/10.1371/journal.pone.0148413}},
  doi          = {{10.1371/journal.pone.0148413}},
  volume       = {{11}},
  year         = {{2016}},
}