Whole-head mapping of middle-latency auditory evoked magnetic fields |
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| Institution: | 1. Low Temperature Laboratory (LTL), Helsinki University of Technology, 02150 Espoo Finland;2. Neuromag Ltd., c/o LTL, Helsinki University of Technology, 02150 Espoo Finland;1. Department of Pediatric Anesthesia, BC Children''s Hospital, Vancouver, BC, Canada;2. Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, BC, Canada;3. Cognition Institute, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK;4. Plymouth University Penninsula School of Medicine and Dentistry, The John Bull Building, Plymouth Science Park, Plymouth, Devon PL6 8BU, UK;5. Department of Anesthesiology, Vanderbilt University Medical Centre, Nashville, TN, USA;1. Institute of Cognitive Neuroscience and Psychology, RCNS, HAS, Budapest, Hungary;2. Eötvös Loránd University, Budapest, Hungary;3. Debrecen University, Debrecen, Hungary;1. School of Liberal Arts, Korea University of Technology and Education, Cheonan 31253, Republic of Korea;2. Department of Applied Physics and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea;1. Dpto. de Fís. Mater., UPV/EHU, San Sebastián, 20009, Spain;2. Dpto. de Física Aplicada, EUPDS, UPV/EHU, 20018, San Sebastian, Spain;3. IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain;4. Faculty of Physics, Lomonosov Moscow State University, 11991, Moscow, Russian Federation |
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| Abstract: | We recorded middle-latency auditory evoked magnetic fields from 9 healthy subjects with a 122-channel whole-head SQUID gradiometer. The stimuli were click triplets, 2.5 msec in total duration, delivered alternately to the two ears once every 333 msec. Contralateral clicks elicited P30m responses in 16 and P50m responses in 12 out of 18 hemispheres studied; ipsilateral clicks did so in 7 and 13 hemispheres, respectively. The field patterns were satisfactorily explained by current dipoles in 16 and 4 hemispheres for contra- and ipsilateral P30m, and in 4 and 10 hemispheres for contra- and ipsilateral P50m. The peak latencies of P30m and P50m were not affected by stimulation side. The results show that middle-latency auditory evoked responses receive a strong contribution from auditory cortical structures, and that differences of input latency to cortical auditory areas, evaluated from MLAEF latencies, do not explain the latency differences seen in late auditory evoked fields to contralateral vs. ipsilateral stimulation. |
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