Abstract
The mechanism for the activation of cerebral function through singing and listening music was investigated. In this research, the effect of singing and listening to music on cerebral function and the effects on autonomic nerve systems were clarified. The fluctuation of oxyHb was analyzed for quantifying the active state of cerebral function. The CSI to investigate the activation level of sympathetic nerve and the CVI to investigate the activation level of parasympathetic nerve were analyzed for quantifying the fluctuation of autonomic nerve systems. The result of experiment showed that the oxyHb increased during the music tasks and the oxyHb decreased during the rest. Additionally, it was shown that the sympathetic nerve became predominant in singing music. In addition to this, we proposed a new evaluation index quantifying the active status of cerebral function using the absolute value of oxyHb and the differential value of oxyHb. By use of this evaluation index, the effectiveness of relaxation with listening music and relaxation without music on the active status of cerebral function were investigated. In these investigations, the effectiveness of music therapy was increased when the parasympathetic nerve became predominant efficiently
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