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Visualization of Gray Matter Myelin and Fiber Bundles Critical for Relative Pitch: A Role of the Left Posterior Long Insular Cortex Yuichiro Shimizu 1,2 , Kuniyoshi L. Sakai 1,2 1Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo 2CREST, Japan Science and Technology Agency Keyword: 相対音感 , 島皮質 , 髄鞘 , 拡散MRI , relative pitch , insular cortex , myelin , diffusion MRI pp.1147-1155
Published Date 2015/9/1
DOI https://doi.org/10.11477/mf.1416200274
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Abstract

Relative pitch is the ability to identify a tone pitch based on external or internal pitches. Here we used magnetic resonance imaging (MRI) to determine which cortical region is responsible for relative pitch. Forty-eight participants were asked to listen to 24 piano tones, and then write down the names of the tones (except reference tones of a1=440 Hz, which were intermittently presented three times). We classified the participants into three groups based on their task scores: Group A (n=12, full points), Group B (n=22, 6-20 points), and Group C (n=14, 0-5 points). We focused on the myelin of the gray matter, which can be visualized by the ratio of MR signals from a pair of T1- and T2-weighted images. We found significantly increased ratios in the left posterior long insular cortex for Group A. We also observed more consistent pathways in the anterior region of the left middle longitudinal fasciculus for Group A compared to Group C, which passed through the left superior temporal gyrus. Because these regions are involved in the processing of speech sounds, the present results suggest that the ability to identify musical pitches is associated with universal linguistic abilities.


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電子版ISSN 1344-8129 印刷版ISSN 1881-6096 医学書院

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