Characteristics of the background fields in multichannel-recorded magnetic field responses |
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| Affiliation: | 1. Research Institute for Electronic Science, Hokkaido University, Sapporo 060 Japan;2. National Institute for Physiological Sciences, Okazaki National Institutes, Okazaki 444 Japan;1. Department of Otorhinolaryngology, Head and Neck Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;2. Department of Physiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;1. Department of Physiology, School of Medicine, Cellular and the Molecular Research Center, Guilan University of Medical Science, Rasht, Iran;2. Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran;3. Department of Parasitology, School of Medicine, Guilan University of Medical Science, Rasht, Iran;4. Department of Microbiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran;5. Department of Orthopedics, Poorsina Hospital, Faculty of Medicine, Guilan University of Medical Sciences, Rasht, Iran;6. Student Research Committee, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran;7. Burn and Regenerative Medicine Research Center, Guilan University of Medical Sciences, Rasht, Iran;8. Department of Medical-Surgical Nursing, School of Nursing and Midwifery, Guilan University of Medical Sciences, Rasht, Iran;1. Keio University School of Medicine, Department of Otorhinolaryngology, Head and Neck Surgery, 35 Shinanomachi, Shinjuku-ku 160-8582, Japan;2. Keio University School of Medicine, Department of Physiology, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;1. Departamento de Psicología Biológica y de la Salud, Universidad Autónoma de Madrid, Spain;2. Wisconsin National Primate Research Center, Madison, WI, U.S.A.;3. Psychology Department, University of Wisconsin, Madison, WI, U.S.A. |
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| Abstract: | We have studied the background fields in the auditory evoked magnetic field responses recorded with a 37-channel SQUID magnetometer. The background fields were found to have a main contribution from the spontaneous fields, which originate in the neural activities of the brain. The spontaneous fields had strong spatial correlation across the recording sites even after averaging over 100 epochs. The spatial distribution of the spontaneous field consisted of 3 main components of single extremum pattern, dipolar pattern, and a dipolar pattern with some distortion. Computer simulations of the localization of a single dipole source of the evoked field response showed that the spontaneous background field could bring about large location errors in an unpredictable manner, as compared with the location errors caused by a spatially random Gaussian noise field. |
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