Abstract
Human beings feel sound in various ways, depending on the environments. For instance, one hears car's engine sound while driving the car in the way different from while hearing it coming from outdoors inside the house. In this paper, the analysis of brain activation to various sounds was conducted using near-infrared spectroscopy. It turned out that the listening to music and uncomfortable sound decreased oxyHb in the prefrontal cortex. This reaction can be considered the response to the concentration on the sound. It also tuned out that there is a viewpoint that the decrease of oxyHb in a brain does not necessarily mean the the decline in the neural activity but the brain activation reaction. It is expected to qualify audio information extracted from these two regions and to serve the plan of sound design.
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