Cerebellar activity before teeth-clenching using magnetoencephalography |
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| Authors: | Takashi Iida Misao Kawara Naruhito Hironaga Andreas A. Ioannides |
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| Affiliation: | 1. Department of Clinical Oral Physiology, Nihon University School of Dentistry at Matsudo, Japan;2. Laboratory for Human Brain Dynamics, RIKEN, Brain Science Institute (BSI), Japan;1. Restorative Dentistry, School of Dentistry, West Virginia University, PO Box 9495, Morgantown, WV 26506, USA;2. Department of Prosthodontics, School of Dentistry, University of North Carolina, 330 Brauer Hall, CB# 7450, Chapel Hill, NC 27599-7450, USA;3. Department of Prosthodontics, The University of Iowa College of Dentistry, 801 Newton Road, Dental Sciences Building S432, Iowa City, IA 55242, USA;1. Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Aarhus C, Denmark;2. MINDLab, Center for Functionally Integrative Neuroscience, Aarhus University Hospital, Aarhus C, Denmark;3. Hammel Neurorehabilitation and Research Centre, Hammel, Denmark;4. GT-Bionics Lab, School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA;1. Division of Advanced Prosthodontics, University of California Los Angeles, Los Angeles, CA, USA;2. Loma Linda University School of Dentistry, Loma Linda, CA, USA;3. Division of Advanced Prosthodontics, UCLA School of Dentistry, Los Angeles, CA, USA;1. Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, Japan;2. Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Denmark;3. Scandinavian Center for Orofacial Neurosciences (SCON), Denmark;4. Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden;1. Section of Orofacial Pain and Jaw Function, Department of Dentistry, Aarhus University, Denmark;2. Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden;3. Scandinavian Center for Orofacial Neurosciences (SCON), Sweden;1. Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-nishi, Matsudo Chiba 271-8587, Japan;2. Section of Orofacial Pain and Jaw Function, Aarhus University, Department of Dentistry, Denmark;3. Hammel Neurorehabilitation Centre and University Research Clinic, Denmark;4. Scandinavian Center for Orofacial Neuroscience (SCON), Sweden;5. Department of Oral Physiology, Faculty of Dentistry, University of Toronto, Toronto, Canada;6. Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Canada;7. Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden |
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| Abstract: | PurposeThe aim of present magnetoencephalography study was conducted to investigate how the cerebellum is involved in intracerebral activity immediately before conscious and voluntary teeth-clenching.MethodsWe recorded the neuromagnetic signal immediately before teeth-clenching in five healthy subjects. A single trial consisted of self-paced teeth-clenching for 2 s followed by a semi-randomized interval of 2–4 s, and 25 trials were performed in a single session. Each subject performed a total of 125 trials over 5 sessions. The subjects also performed five control sessions without the teeth-clenching task. The subjects were asked to observe a visual cue providing task information. We used magnetic field tomography to obtain a tomographic reconstruction of brain activity for each time slice of the average signal for each subject and session. Activation of regions of interest by cerebellar neuron activity was computed from the magnetic field tomography result.ResultsCerebellar activation before the teeth-clenching task was identified in all five subjects: bilaterally in three, and unilaterally in two. The peak amplitudes for the left and right cerebellar hemispheres in the main session were significantly greater than those in the control session (P < 0.01). Left and right cerebellar hemisphere activities were detected approximately 150 ms after visual cue.ConclusionOur findings suggest that the cerebellum is involved in the signal pathway immediately before teeth-clenching. |
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