Hemispheric asymmetry of the auditory evoked N100m response in relation to the crossing point between the central sulcus and Sylvian fissure |
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| Institution: | 1. Brain Center Rudolf Magnus, Dept. Neurology and Neurosurgery, UMC Utrecht, Utrecht, The Netherlands;2. MIRA Institute for Biomedical Technology and Technical Medicine, Twente University, Enschede, The Netherlands;3. Elekta Oy, Helsinki, Finland;4. Neurosurgery Department, University Hospital Zurich, Zurich, Switzerland;5. Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland;6. Department of Physics, University of Washington, USA;7. Institute for Learning and Brain Sciences, University of Washington, USA;8. Wellcome Trust Laboratory for MEG Studies, Aston Brain Centre, Aston University, Birmingham, United Kingdom;9. SEIN – Stichting Epilepsie Instellingen Nederland, Heemstede, The Netherlands;10. Department of Clinical Neurophysiology and Magnetoencephalography Center, VU University Medical Center, Amsterdam, The Netherlands |
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| Abstract: | The positions of the bilateral N100m sources of the auditory evoked magnetic fields (AEFs) were measured in relation to the central sulcus (CS) using an MRI-linked whole head magnetoencephalography system in 20 right-handed normal male subjects. The location of the N20m source of the median nerve-stimulated somatosensory evoked magnetic fields (SEFs), in the left hemisphere was 3.9±5.4 mm (mean±SD) posterior to that in the right hemisphere (P<0.005). The crossing point (CP) between the CS and Sylvian fissure in the left hemisphere was 4.3±4.8 mm posterior to that in the right hemisphere (P<0.001). The N100m sources were posterior to the CP in both hemispheres. The left hemispheric N100m source was 9.4±6.4 mm posterior to that on the right (P<0.0001) in absolute position. The relative distance between CP and the N100m source was 22.7±8.5 mm in the left hemisphere and 17.7±5.3 mm in the right hemisphere (P<0.01). Comparison of positions of the AEF sources and the CS as defined by the SEF demonstrated functional asymmetry of the human temporal lobe and possible source extension of the AEF-N100m beyond the Heschl gyrus over the planum temporale. |
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