Saberi K, Takahashi Y, Konishi M, Albeck Y, Arthur B J, Farahbod H
Division of Biology, California Institute of Technology, Pasadena 91125, USA.
Neuron. 1998 Oct;21(4):789-98. doi: 10.1016/s0896-6273(00)80595-4.
The detection of interaural time differences (ITDs) for sound localization critically depends on the similarity between the left and right ear signals (interaural correlation). We show that, like humans, owls can localize phantom sound sources well until the correlation declines to a very low value, below which their performance rapidly deteriorates. Decreasing interaural correlation also causes the response of the owl's tectal auditory neurons to decline nonlinearly, with a rapid drop followed by a more gradual reduction. A detection-theoretic analysis of the statistical properties of neuronal responses could account for the variance of behavioral responses as interaural correlation is decreased. Finally, cross-correlation analysis suggests that low interaural correlations cause misalignment of cross-correlation peaks across different frequencies, contributing heavily to the nonlinear decline in neural and ultimately behavioral performance.
用于声音定位的双耳时间差（ITD）检测严重依赖于左右耳信号之间的相似性（双耳相关性）。我们发现，与人类一样，猫头鹰能够很好地定位虚拟声源，直到相关性下降到非常低的值，低于该值时它们的表现会迅速恶化。双耳相关性的降低还会导致猫头鹰顶盖听觉神经元的反应呈非线性下降，先是快速下降，随后逐渐减缓。对神经元反应统计特性的检测理论分析可以解释随着双耳相关性降低行为反应的变化。最后，互相关分析表明，低双耳相关性会导致不同频率间互相关峰值的错位，这在很大程度上导致了神经及最终行为表现的非线性下降。
