Daikoku Tatsuya, Ogura Hiroshi, Watanabe Masayuki
Graduate School of Nursing and Rehabilitation Sciences, Showa University, Yokohama, Kanagawa, Japan.
Neurol Res. 2012 Jul;34(6):557-63. doi: 10.1179/1743132812Y.0000000047. Epub 2012 May 30.
The aim of the present study was to identify the variation of cerebral hemodynamics in relation to listening to chord progressions involving consonant or dissonant chords based on western music theory by near-infrared spectroscopy. We also tried to find out the influence of musical education on the cortical hemodynamics.
Twenty subjects participated in this study. They were classified into two groups, namely persons with and without special musical training histories. We used two types of chord progressions involving consonant and dissonant chords as stimuli. Then, the hemodynamics of each group was analyzed by optical topography to investigate the effects of each type of chord in the areas of left and right auditory cortices.
In the left auditory cortex (superior temporal cortex), the group with higher musical training showed a significant increase in oxyhemoglobin (oxy-Hb) when listening to dissonant chords as compared with consonant chords, while the group without higher education for music did not show significant changes in oxy-Hb between consonant chords and dissonant chords. No significant changes in oxy-Hb in the right auditory cortex were observed in response to either chord, neither in the group with higher education for music, nor in the group without it.
Our results suggest that special musical training could enhance music-syntactic processing in the left auditory area and react more sensitively to the dissonant chords.
本研究旨在基于西方音乐理论，通过近红外光谱法确定与聆听包含协和或不协和和弦的和弦进行相关的脑血流动力学变化。我们还试图找出音乐教育对皮质血流动力学的影响。
20名受试者参与了本研究。他们被分为两组，即有和没有特殊音乐训练经历的人。我们使用两种类型的包含协和与不协和和弦的和弦进行作为刺激。然后，通过光学地形图分析每组的血流动力学，以研究每种类型的和弦在左右听觉皮层区域的影响。
在左听觉皮层（颞上叶皮层），音乐训练程度较高的组在聆听不协和和弦时与协和和弦相比，氧合血红蛋白（oxy-Hb）显著增加，而没有接受过高等音乐教育的组在协和和弦和不协和和弦之间的oxy-Hb没有显著变化。在右听觉皮层，无论对哪种和弦，接受过高等音乐教育的组和未接受过高等音乐教育的组的oxy-Hb均未观察到显著变化。
我们的结果表明，特殊音乐训练可以增强左听觉区域的音乐句法处理能力，并对不协和和弦做出更敏感的反应。
