Bihemispheric Navigated Transcranial Magnetic Stimulation Mapping for Action Naming Compared to Object Naming in...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Medical Imaging

Background:

• Preoperative language mapping using navigated transcranial magnetic stimulation (nTMS) relies on object naming tasks.
• Current nTMS language maps exhibit lower accuracy compared to intraoperative mapping.
• Improving nTMS accuracy is crucial for effective preoperative planning.

Purpose of the Study:

• To investigate if incorporating a verb retrieval task (action naming) improves nTMS language mapping accuracy.
• To compare error rates and types between object naming and action naming tasks during nTMS.
• To assess the impact of different language tasks on the precision of cortical language mapping.

Main Methods:

• Twenty healthy German speakers participated in the study.
• Navigated transcranial magnetic stimulation (nTMS) was used for language mapping.
• Participants performed both object naming and a novel action naming task.

Main Results:

• Action naming resulted in significantly higher error rates than object naming in both hemispheres.
• Lexico-semantic errors were more prevalent during action naming, suggesting greater impact on verb retrieval.
• Higher error rates were observed in right-hemisphere areas, with trends in specific left-hemisphere regions.

Conclusions:

• Action naming, combined with detailed error analysis, may enhance nTMS mapping accuracy for preoperative planning.
• The study highlights the involvement of both left and right hemispheric areas in naming tasks.
• Incorporating diverse language tasks in nTMS can lead to more precise cortical language representations.