Abstract
The purpose of this experiment is to evaluate that it is pleasant or unpleasant toward the noise with measuring a Prefrontal Hemodynamics Response. 12 healthy adults who had the normal sense of hearing were chosen as a subject. The Audiogram was measured before and after of this experimentation. They had Speech Sound told from the speaker. The sound of the commotion, machine sound and the murmur of a stream sound were chosen as a noise. While they had sound told, a change in their Deoxy Hb and Total Hb was measured by Near-Infrared-Spectroscopy. When only Speech Sound was told, it showed a tendency to raise it in both of Deoxy Hb and Total Hb. When it had only noise told, there was a remarkable difference by the machine sound. As for the Speech Sound, the cases of only the noise showed a tendency of decreasing conversely. When noise was mixed to the Speech Sound, a change in Deoxy Hb under the machine sound was the most remarkable in comparison with the sound of the commotion and the murmur of a stream sound. We think that the measurement of Hemodynamics Response of the brain by Near-Infrared-Spectroscopy can become a physiology index.
