Elucidation on mechanisms of dynamic evaluation for auditory environment using Magnetoencephalography

为了阐明人脑听觉环境的动态评价机制，我们研究了声音的物理因素、心理反应和生理反应(听觉诱发磁反应)的时间变化之间的关系。为了阐明声压级(SPL)的变化对听觉诱发反应的影响，我们检查了SPL改变后大约100ms的反应(N1m‘)。结果显示，N1M波幅增加，SPL变化较大。幅度变化的模式可能反映了听神经和/或初级听觉皮质激活的不同。为了阐明物理因素的声音对心理烦恼的影响，我们考察了物理因素与列车车厢或车站内及空调产生的声音的烦扰之间的关系。结果表明，SPL、基频、基频强度和频谱质心都可以预测烦躁。

To elucidate mechanisms of dynamic evaluation for auditory environment in human brain, we investigated the relationship between temporal variation of physical factors of sound, psychological response, and physiological response (auditory evoked magnetic responses). To clarify the effects of variation of sound pressure level (SPL) on the auditory evoked response, we examined responses approximately 100 ms after an SPL change (the N1m'). The results revealed that N1m' amplitude increased with greater SPL changes. The pattern of amplitude change may reflect a difference in activation in the auditory nerve and/or primary auditory cortex. To clarify the effects of physical factors of sound on psychological annoyance, we examined relationship between physical factors and annoyance to sounds in train cars or stations and produced by air conditioning. The results indicated that annoyance can be predicted by SPL, fundamental frequency, strength of fundamental frequency, and spectral centroid.