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Updated: Jul 4, 2025

Functional Mapping with Simultaneous MEG and EEG

Functional Mapping with Simultaneous MEG and EEG

Published on: June 14, 2010

Decoding Semantics from Dynamic Brain Activation Patterns: From Trials to Task in EEG/MEG Source Space.

Federica Magnabosco¹, Olaf Hauk²

¹MRC Cognition and Brain Sciences Unit, University of Cambridge, 15 Chaucer Road, Cambridge CB2 7EF, United Kingdom federica.magnabosco@mrc-cbu.cam.ac.uk.

|February 6, 2024

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Understanding the semantic brain network is key. This study reveals task information is processed early across the network, while word meaning is processed later in specific regions like the anterior temporal lobes.

Area of Science:

Neuroscience
Cognitive Neuroscience
Brain Imaging

Background:

The temporal dynamics and network dependencies of semantic processing remain unclear.
Understanding how the brain processes word meaning and task demands is crucial.

Purpose of the Study:

To decode task and stimulus information from source-localized EEG/MEG data.
To investigate the temporal dynamics of the semantic brain network.

Main Methods:

Source space decoding of EEG/MEG data during lexical decision and semantic decision tasks.
Analysis of five semantic categories across multiple brain regions of interest (ROIs).
Comparison of ROI-by-ROI and combined-ROI decoding approaches.

Main Results:

Keywords:

MVPA decoding semantic cognition semantics task visual word recognition

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Published on: October 24, 2012

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

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Published on: July 26, 2019

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Last Updated: Jul 4, 2025

Functional Mapping with Simultaneous MEG and EEG

Functional Mapping with Simultaneous MEG and EEG

Published on: June 14, 2010

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

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Published on: October 24, 2012

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Published on: July 26, 2019

Task information was decoded across all ROIs early (50-100 ms).
Semantic word category was decoded later (250-500 ms) in specific ROIs (lATL, rATL, PTC, IFG).
Task effects are widely distributed, while stimulus effects are more focal.

Conclusions:

The semantic network is broadly distributed, with bilateral anterior temporal lobes playing a key role.
Different decoding methods are optimal for task versus stimulus information.
Task demands influence semantic processing across the network from early stages.