NDLI: Masking the Auditory Evoked Potential in TMS–EEG: A Comparison of Various Methods

Content Provider	Springer Nature Link
Author	Braack, Esther M. Vos, Cecile C. Putten, Michel J. A. M.
Copyright Year	2013
Abstract	There is growing interest in combining transcranial magnetic stimulation (TMS) with electroencephalography (EEG). Because TMS pulses are accompanied by a clicking sound, it is very likely that part of the response in the EEG consists of an auditory evoked potential (AEP). Different methods have been applied to mask the sound of TMS. However, it is unclear which masking method is most effective in reducing the AEP. In this study we explore the presumed contribution of the AEP to the response and evaluate different ways to mask the TMS clicking sound. Twelve healthy subjects and one completely deaf subject participated in this study. Eight different masking conditions were evaluated in nine hearing subjects. The amplitude of the N100–P180 complex was compared between the different masking conditions. We were not able to completely suppress the N100–P180 when the coil was placed on top of the head. Using an earmuff or exposing the subjects to white or adapted noise caused a small but significant reduction in N100–P180 amplitude, but the largest reduction was achieved when combining a layer of foam, placed between coil and head, with white or adapted noise. The deaf subject also showed a N100–P180 complex. We conclude that both the TMS clicking sound and cortical activation by the magnetic pulse contribute to the N100–P180 amplitude.
Starting Page	520
Ending Page	528
Page Count	9
File Format	PDF
ISSN	08960267
Journal	Brain Topography
Volume Number	28
Issue Number	3
e-ISSN	15736792
Language	English
Publisher	Springer US
Publisher Date	2013-09-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Transcranial magnetic stimulation (TMS) Electroencephalography (EEG) Auditory evoked potential Neurosciences Psychiatry Neurology
Content Type	Text
Resource Type	Article
Subject	Neurology Anatomy Radiology, Nuclear Medicine and Imaging Neurology (clinical) Radiological and Ultrasound Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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