Study Design for Navigated Repetitive Transcranial Magnetic Stimulation for Speech Cortical Mapping

作者： Pantelis Lioumis1,2, Salla Autti1,2, Juha Wilenius2,3, Selja Vaalto1,2,3, Henri Lehtinen3,5, Aki Laakso4, Erika Kirveskari3, Jyrki P. Mäkelä2, Mia Liljeström1,2, Hanna Renvall1,2 1Department of Neuroscience and Biomedical Engineering,Aalto University School of Science, 2BioMag Laboratory, HUS Diagnostic Center,University of Helsinki, Aalto University, and Helsinki University Hospital, 3Department of Clinical Neurophysiology, HUS Diagnostic Center,University of Helsinki and Helsinki University Hospital, 4Department of Neurosurgery,University of Helsinki and Helsinki University Hospital, 5Department of Child Neurology,University of Helsinki and Helsinki University Hospital

简介：

Overview

Navigated repetitive transcranial magnetic stimulation (rTMS) is a non-invasive technique for mapping speech-related cortical areas, aiding in surgical planning and direct cortical stimulation during surgery. This article details a protocol for reliable speech cortical mapping for preoperative evaluation and research.

Key Study Components

Area of Science

• Neuroscience
• Speech Mapping
• Transcranial Magnetic Stimulation

Background

• rTMS is a non-invasive alternative to direct cortical stimulation.
• It allows for flexible task adjustments and can be applied to healthy subjects.
• The technique is useful for identifying language network nodes in stroke patients.
• Careful parameter adjustments are crucial for effective mapping.

Purpose of Study

• To provide a reliable method for speech cortical mapping.
• To enhance preoperative evaluations for brain surgery.
• To facilitate research on language processing in the brain.

Methods Used

• Baseline object naming tasks with standardized images.
• Use of accelerometers to record speech onset.
• Adjusting inter-picture intervals based on subject performance.
• Application of rTMS to targeted speech-related cortical areas.

Main Results

• Errors in naming were linked to specific cortical areas.
• Parameter adjustments improved task difficulty and accuracy.
• Comparison with direct cortical stimulation showed similar results.
• Identified types of naming errors during stimulation.

Conclusions

• rTMS is a viable alternative for speech mapping in surgical contexts.
• Careful monitoring and adjustments are essential for success.
• The protocol can be adapted for various language tasks.

Frequently Asked Questions