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Related Experiment Video

Updated: Jul 9, 2025

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
08:45

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Limiting parameter range for cortical-spherical mapping improves activated domain estimation for attention modulated

Fumina Mori1, Masato Sugino1, Kenta Kabashima2

  • 1School of Engineering, The University of Tokyo, Tokyo, Japan.

Journal of Neuroscience Methods
|December 3, 2023
PubMed
Summary

Attention influences auditory processing by expanding activated brain domains in the auditory cortex on a millisecond timescale. This study developed a novel method to accurately measure these attention-related changes in complex brain structures.

Keywords:
AttentionAuditory evoked fieldDomain estimationInverse problemMagnetoencephalography

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Last Updated: Jul 9, 2025

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biophysics

Background:

  • Attention plays a crucial role in selecting sensory information for brain processing.
  • Magnetoencephalography (MEG) was used to investigate auditory-evoked responses (N100m) and the effects of attention.
  • Estimating brain activity in the complex, folded structure of the auditory cortex presents significant challenges.

Purpose of the Study:

  • To evaluate the millisecond-scale effects of attention on auditory processing.
  • To develop and validate a method for estimating brain activity domains within the complex auditory cortex.
  • To determine if attention modulates the extent of activated cortical areas.

Main Methods:

  • Applied a novel domain estimation method using magnetoencephalography (MEG) to analyze auditory-evoked responses (N100m).
  • Defined a limited parameter search range to focus current source estimation within the auditory cortex.
  • Compared activity estimations with and without range limitations in the auditory cortex.

Main Results:

  • Without range limitation, activity was estimated outside the auditory cortex.
  • With range limitation, activity was accurately localized to the primary or higher auditory cortex.
  • Attention increased the area of activated domains within the auditory cortex, particularly in individuals with higher N100m amplitudes.

Conclusions:

  • A method for limiting the parameter search range effectively estimates activated domains in complex cortical structures.
  • Attention can increase the extent of activated domains in the auditory cortex on the millisecond timescale.
  • Accurate estimation requires careful limitation of the search region in folded cortical areas.