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Localization of Sensorimotor Cortex Using Navigated Transcranial Magnetic Stimulation and Magnetoencephalography
Minna Pitkänen1,2,3, Shogo Yazawa4, Katja Airaksinen5,6,7
1Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, Espoo, Finland. minna.pitk@gmail.com.
Brain Topography
|May 17, 2019
Summary
Transcranial magnetic stimulation (TMS) is more effective than magnetoencephalography (MEG) for mapping sensorimotor cortex areas. TMS provided more consistent results across participants compared to MEG methods like corticomuscular coherence (CMC).
Area of Science:
- Neuroscience
- Motor Control
- Brain Mapping
Background:
- Sensorimotor cortex mapping is crucial for understanding motor and sensory functions.
- Navigated transcranial magnetic stimulation (TMS) and magnetoencephalography (MEG) are common mapping techniques.
- Direct comparisons of TMS and MEG mapping precision are limited.
Purpose of the Study:
- To compare the precision and reliability of TMS and MEG for sensorimotor cortex mapping.
- To investigate the differences in localization accuracy between TMS and MEG-derived measures.
- To determine the viability of TMS versus MEG in clinical and research settings.
Main Methods:
- Mapped TMS center of gravities (CoGs) and MEG somatosensory evoked fields (SEFs) in ten healthy adults.
- Measured corticomuscular coherence (CMC) and corticokinematic coherence (CKC) during voluntary muscle activity and finger waving.
- Compared localization data from TMS (FDI, ECR muscles) and MEG (index finger stimulation, muscle activation).
Main Results:
- TMS-inferred localizations (CoGs) showed less inter-participant variability than MEG-inferred localizations (CMC, CKC).
- MEG measures (CMC, CKC) exhibited greater distances between muscle representations compared to TMS.
- MEG SEF locations were, on average, 8 mm lateral to TMS CoGs (p < 0.01).
Conclusions:
- Transcranial magnetic stimulation (TMS) appears more viable than magnetoencephalography (MEG) for precise sensorimotor cortex localization.
- TMS offers greater consistency across individuals for mapping motor cortical areas.
- Further research can refine the integration of TMS and MEG for comprehensive brain mapping.
Keywords:
Corticokinematic coherenceCorticomuscular coherenceMagnetoencephalographyMotor evoked potentialNavigated transcranial magnetic stimulationSomatosensory evoked fieldMore Related Videos
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