Influence of the language dominant hemisphere on the activation region of the cerebral cortex during mastication

  • Matsushima Yasuhiko
    Graduate School of Dentistry (Department of Fixed Prosthodontics and Occlusion Osaka Dental University)
  • Kusumoto Tetsuji
    Department of Fixed Prosthodontics and Occlusion, Osaka Dental University
  • Kawazoe Takayoshi
    Department of Fixed Prosthodontics and Occlusion, Osaka Dental University

Bibliographic Information

Other Title
  • 咀嚼運動における大脳皮質の賦活部位に言語優位半球が及ぼす影響
  • ソシャク ウンドウ ニ オケル ダイノウヒシツ ノ フカツ ブイ ニ ゲンゴ ユウイ ハンキュウ ガ オヨボス エイキョウ

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Abstract

We used functional magnetic resonance imaging (fMRI) to examine the relationship of the activation region of the cerebral cortex during mastication with the language dominant hemisphere. Twelve healthy subjects were asked to chew a special gum 50 times on each side of the mouth, the gum changed color, becoming a deeper red, as it was chewed. The depth of red of the chewed gum was used to ascertain the habitual masticatory side. Measurements were also performed on a conventional whole body 1.5 T clinical scanner using a single shot, multislice echo-planar imaging sequence. The subjects were asked to masticate first on the right side, and then on the left side. As well, they were instructed to do a shiritori test, which is a word game. Computer analysis of the fMRI was done using SPM 99 software (p<0.001, paired t-test). We found that the sensorimotor cortex activated by masticatory movements always contains language dominant hemisphere.

Journal

  • Shikaigaku

    Shikaigaku 68 (1), 111-119, 2005

    Osaka Odontological Society

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