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Journal of Dental Research
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Clinical

Hemispheric Dominance of Tongue Control Depends on the Chewing-side Preference

H. Shinagawa1,*, T. Ono1, Y. Ishiwata1, E. Honda2,5, T. Sasaki2, M. Taira4, A. Iriki3 and T. Kuroda1

1 Maxillofacial Orthognathics,
2 Oral/Maxillofacial Radiology, and
3 Cognitive Neurobiology, Graduate School, Tokyo Medical and Dental University, 5-45, Yushima 1-chome, Bunkyo-Ku, Tokyo 113-8549, Japan;
4 Department of Physiology, Nihon University, School of Medicine, Tokyo 113-8610, Japan; and
5 Department of Oral and Maxillofacial Radiology, the University of Tokushima, Tokushima 770-8503, Japan;

Correspondence: *corresponding author, h-shinagawa.mort{at}tmd.ac.jp

Blood-oxygenation-level-dependent (BOLD)-functional magnetic resonance imaging (fMRI) is known to be a non-invasive technique for studying human brain function. The purpose of this study was to apply BOLD-fMRI to identify brain areas responsible for producing tongue movements and their relation to chewing-side preference in 15 normal right-handed volunteers. A marked increase in BOLD signals was detected in primary sensorimotor cortices upon protrusion and in rightward and leftward tongue movements compared with at rest. In 10 subjects with an evident chewing-side preference, the BOLD signal change in the primary sensorimotor cortex was significantly greater on the side contralateral to the preferred chewing side. The results suggest that there is a relationship between hemispheric dominance and chewing-side preference in primary sensorimotor cortices responsible for tongue movements.

Key Words: tongue movement • sensorimotor cortex • chewing-side preference • fMRI • human

Journal of Dental Research, Vol. 82, No. 4, 278-283 (2003)
DOI: 10.1177/154405910308200407
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