与带通噪声双耳互相关相关的听觉诱发磁场。

Auditory evoked magnetic fields in relation to interaural cross-correlation of band-pass noise.

作者信息

Soeta Yoshiharu, Hotehama Takuya, Nakagawa Seiji, Tonoike Mitsuo, Ando Yoichi

机构信息

Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.

出版信息

Hear Res. 2004 Oct;196(1-2):109-14. doi: 10.1016/j.heares.2004.07.002.

DOI:10.1016/j.heares.2004.07.002

PMID:15464307

Abstract

Auditory evoked magnetic fields of the human brain were analyzed in relation to the magnitude of the inter-aural cross-correlation (IACC). IACC of the stimuli was controlled by mixing diotic bandpass and dichotic independent bandpass noise in appropriate ratios. The auditory stimuli were binaurally delivered through plastic tubes and earpieces inserted into ear canals of the nine volunteers with normal hearing who took part in this study. All source signals had the same sound pressure level. Auditory evoked fields (AEFs) were recorded using a neuromagnetometer in a magnetically shielded room. Combinations of a reference stimulus (IACC=1.0) and test stimuli (IACC=0.2, 0.6, 0.85) were presented alternately at a constant interstimulus interval of 0.5 s and MEGs recorded. The results showed that the N1m latencies were not affected by IACC; however, the peak amplitude of N1m significantly decreased with increasing IACC.

摘要

对人脑的听觉诱发磁场与双耳互相关（IACC）的大小进行了分析。通过以适当比例混合双耳带通和双耳独立带通噪声来控制刺激的IACC。听觉刺激通过塑料管和耳塞双耳传递给参与本研究的9名听力正常的志愿者，耳塞插入他们的耳道。所有源信号具有相同的声压级。在磁屏蔽室内使用神经磁强计记录听觉诱发场（AEF）。以0.5秒的恒定刺激间隔交替呈现参考刺激（IACC = 1.0）和测试刺激（IACC = 0.2、0.6、0.85）的组合，并记录脑磁图（MEG）。结果表明，N1m潜伏期不受IACC影响；然而，N1m的峰值幅度随着IACC的增加而显著降低。