Somatosensory evoked magnetic fields following stimulation of the lip in humans |
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| Affiliation: | 1. Department of Physics, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Darussalam, Banda Aceh, 23111, Aceh, Indonesia;2. Department of Electrical Engineering, University of Pelita Harapan, 1100 M.H. Thamrin Boulevard, Lippo Village, Tangerang 15811, Indonesia.;3. Department of Industrial Engineering, University of Pelita Harapan, 1100 M.H. Thamrin Boulevard, Lippo Village, Tangerang 15811, Indonesia.;4. Department of Computer Engineering, Bina Nusantara University, 9 K.H. Syahdan, Jakarta 14810, Indonesia;5. Research Center for Physics, Indonesia Institute of Sciences, Kawasan PUSPIPTEK, Serpong, Tangerang Selatan 15314, Indonesia;6. Research Center of Maju Makmur Mandiri Foundation, 40/80 Srengseng Raya, Jakarta 11630, Indonesia;7. Fukui Science Education Academy, Takagi Chuou 2 choume, Fukui 910-0804, , Japan;8. Physics of Magnetism and Photonics Group, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 10 Ganesha, Bandung 40132, Indonesia;1. National Centre for Physics, Quaid-i-Azam University Campus, 45320 Islamabad, Pakistan;2. Department of Physics, Mirpur University of Science and Technology (MUST), Mirpur 10250, AJK, Pakistan;3. Department of Physics, University of Azad Jammu and Kashmir, Muzaffarabad 13100, Azad Kashmir, Pakistan;1. Australian and New Zealand Intensive Care Research Centre (ANZIC RC), School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia;2. Department of Anesthesiology, Intensive Care and Pain Medicine, University of Helsinki and Helsinki University Hospital, Finland;3. Department of Intensive Care, The Alfred Hospital, Melbourne, Australia;4. ANZICS Centre for Outcome and Resource Evaluation CORE, Melbourne, Australia;5. Intensive Care Unit, Austin Health, Heidelberg, Australia;1. Unidad de Investigación Biomédica, Delegación Durango, Instituto Mexicano del Seguro Social, México;2. Faculty of Medicine and Nutrition, Juarez University of Durango State, Durango, Dgo., México;3. Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran;4. Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran |
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| Abstract: | The topography of somatosensory evoked magnetic fields (SEFs) following stimulation of the upper and lower lips was investigated in 6 normal subjects. When the lateral side of the upper lip was stimulated. P20m and its counterpart, N20m, were identified in the hemisphere contralateral to the stimulated side. The equivalent current dipoles (ECDs) of N20m-P20m were considered to be located in the lip area of the primary sensory cortex (SI). Middle latency deflections (N40m-P40m, N60m-P60m, and N80m-P80m) were identified in bilateral hemispheres. Their ECDs were located in the SI in both hemispheres. Long latency deflections (P110m-N110m) were recognized in both hemispheres, and their ECDs were located inferior to the SI, in an area considered to be the secondary sensory cortex (SII). When the midline of the lip was stimulated, similar short and middle latency deflections were also identified, but SII deflections (P110m-N110m) were decreased in amplitude. When the lower lip was stimulated, the ECDs of short and middle latency deflections were located at a site in the SI inferior to or near those elicited by upper lip stimulation. The ECDs of P110m-N110m were located in an area of the SII similar to that upon stimulation of the upper lip, but their orientations were different. |
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