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Brain Imaging

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

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Mapping the connectivity underlying multimodal (verbal and non-verbal) semantic processing: a brain

Sylvie Moritz-Gasser¹, Guillaume Herbet, Hugues Duffau

¹National Institute for Health and Medical Research (INSERM), U1051, Plasticity of the Central Nervous System, Human Stem Cells and Glial Tumors, Institute for Neurosciences of Montpellier, Montpellier University Medical Center, 80 Av Augustin Fliche, 34091 Montpellier, France.

Neuropsychologia

|June 20, 2013

Summary

The study found that stimulating the inferior fronto-occipital fascicle disrupts semantic processing. This highlights the crucial role of this white matter tract in understanding meaning for both verbal and non-verbal tasks.

Keywords:

Awake surgery Connectivity Direct electrical stimulation Inferior fronto-occipital fascicle Multimodality Semantic processing

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Published on: December 5, 2014

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Last Updated: May 10, 2026

A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy

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Published on: November 13, 2016

Functional Mapping with Simultaneous MEG and EEG

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Published on: June 14, 2010

Functional Near Infrared Spectroscopy of the Sensory and Motor Brain Regions with Simultaneous Kinematic and EMG Monitoring During Motor Tasks

Functional Near Infrared Spectroscopy of the Sensory and Motor Brain Regions with Simultaneous Kinematic and EMG Monitoring During Motor Tasks

Published on: December 5, 2014

Area of Science:

Neuroscience
Cognitive Science
Neurolinguistics

Background:

Semantic processing enables understanding of words, objects, and facts.
Cortical organization of semantic networks is well-studied, but subcortical connectivity remains less understood.

Purpose of the Study:

To map the white matter substrate of the semantic system using intraoperative direct electrostimulation.
To investigate the role of specific white matter tracts in multimodal semantic processing.

Main Methods:

Intraoperative direct electrostimulation was used on eight awake glioma patients.
Patients performed picture naming and non-verbal semantic association tasks during electrical mapping.
Transient virtual lesions were induced to observe effects on semantic functions.

Main Results:

Direct electrostimulation of the inferior fronto-occipital fascicle consistently induced semantic disturbances in all patients.
These disturbances were reproducible and affected both verbal and non-verbal semantic tasks.
This is the first study to demonstrate the essential role of the left inferior fronto-occipital fascicle in multimodal semantic processing.

Conclusions:

The left inferior fronto-occipital fascicle is critical for multimodal semantic processing.
The findings suggest a potential role for this fascicle in monitoring consciousness related to semantic memory (noetic consciousness).