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Related Experiment Video

Updated: Mar 24, 2026

Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent

Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent

Published on: November 30, 2017

Global Neuromagnetic Cortical Fields Have Non-Zero Velocity.

David M Alexander¹, Andrey R Nikolaev¹, Peter Jurica²

¹Brain and Cognition Research Unit, KU Leuven - University of Leuven, Leuven, Belgium.

|March 9, 2016

Summary

Large-scale traveling brain waves, observed using magnetoencephalography (MEG), reveal globally coherent neural activity. These waves propagate across the cortex, offering insights into brain coordination during sensory processing.

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Area of Science:

Neuroscience
Physics of Complex Systems

Background:

Analysis techniques often obscure globally coherent phase patterns in brain activity.
Aggregating brain activity measures can hinder accurate source localization and inter-areal coherence estimation.

Purpose of the Study:

To analyze single-trial whole-head magnetoencephalography (MEG) data during an apparent motion task.
To investigate the nature and characteristics of globally coherent neural activity patterns.

Main Methods:

Single-trial analysis of whole-head MEG data.
Analysis of brain activity during an observer-triggered apparent motion task.
Examination of neural activity in delta, theta, alpha, and beta frequency bands.

Main Results:

Episodes of globally coherent activity appeared as large-scale waves across frequency bands.
Wave speeds ranged from 0.06 to 4.0 m/s, proportional to temporal frequency.
Coherent wave motion was observed across the entire measurement array, with predictable direction during task-relevant periods.

Conclusions:

A significant portion of the measurable cortical signal exists as large-scale coherent motion.
Observable phase velocities in MEG are influenced by spatial filtering and cortical activity group velocity.
Traveling waves may serve as indicators of global cortical coordination processes.