Department of Psychology, Brooklyn College, CUNY, Brooklyn, New York 11210, USA.
J Acoust Soc Am. 2011 Jul;130(1):302-11. doi: 10.1121/1.3596477.
This experiment was designed to yield precise measures of the statistical properties of perceived sound images. Results are reported for listeners' judgments of intracranial sound image lateral positions in response to binaural tone burst stimuli (250 Hz, 50 ms) with varying interaural phase differences, conditional on the absence or presence of a (left or right) reference monaural tone burst (also 250 Hz, 50 ms) ending 500 ms prior to the test signal. The monaural-reference shifted the position distributions toward the opposite side of the head. The position distribution variance and skewness depended on the mean of the position distribution, not on the interaural phase difference of the stimulus. The standard deviation increased as the mean moved laterally from midline. Near the midline the position distributions were skewed ipsilaterally. Near either ear they were skewed toward the midline. The results suggest that the most important noise limiting performance originates central to brainstem coincidence detector networks.
本实验旨在对感知声音图像的统计属性进行精确测量。报告了听者在无或有（左或右）参考单耳纯音爆裂声（也为 250Hz，50ms）的情况下，对双耳纯音爆裂声刺激（250Hz，50ms）的颅内声音图像侧位判断的结果，该参考声在测试信号前 500ms 结束。单耳参考使位置分布向头部的相反侧移动。位置分布的方差和偏度取决于位置分布的均值，而与刺激的两耳相位差无关。随着均值从中线向外侧移动，标准差增大。在中线附近，位置分布向同侧偏斜。在耳朵附近，它们向中线偏斜。结果表明，限制性能的最重要噪声源源自脑干符合检测网络的中心。
