Al'tman Ia A, Vaĭtulevich S F, Petropavlovskaia E A, Shestopalova L B
Fiziol Cheloveka. 2010 Jan-Feb;36(1):83-92.
The spatial resolution of human auditory system has been studied while the localization of sound source has been changed according to the different temporal patterns of interaural time delay. Two experimental procedures have been run in the same group of subjects: psychophysical procedure (the transformed staircase method) and electrophysiological one (which requires recording of mismatch negativity, the auditory evoked response component). It has been established that 1) the magnitude of the mismatch negativity reflects the extent of spatial deviance of the sound source 2) the mismatch negativity is elicited even at minimal (20 micros) interaural time delays under both temporal patterns (abrupt azimuth change and gradual sound movement at various velocities) 3) the abrupt change of the sound source azimuth results in greater mismatch negativity than the gradual sound movement does, if the interaural time delay exceeds 40 micros 4) the discrimination threshold values of the interaural delay obtained in the psychophysical procedure are greater than the minimal interaural delays that elicit the mismatch negativity, with the exception of the expert listeners who has shown no significant difference.
人类听觉系统的空间分辨率已得到研究，同时根据双耳时间延迟的不同时间模式，声源的定位也发生了变化。在同一组受试者中进行了两种实验程序：心理物理学程序（变换阶梯法）和电生理程序（需要记录失配负波，这是听觉诱发电位成分）。现已确定：1）失配负波的幅度反映了声源空间偏差的程度；2）在两种时间模式（方位角突然变化和以不同速度的声音逐渐移动）下，即使在最小（20微秒）的双耳时间延迟下也能引出失配负波；3）如果双耳时间延迟超过40微秒，声源方位角的突然变化比声音逐渐移动产生的失配负波更大；4）在心理物理学程序中获得的双耳延迟辨别阈值大于引出失配负波的最小双耳延迟，但表现出无显著差异的专业听众除外。
