SOUND LOCALIZATION AND SENSITIVITY TO INTERAURAL TIME DIFFERENCES IN HUMAN INFANTS
SOUND LOCALIZATION AND SENSITIVITY TO INTERAURAL TIME DIFFERENCES IN HUMAN INFANTS
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DOI：
10.2307/1130802
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发表时间：
1991-12-01
影响因子：
4.6
通讯作者：
ODOM, RD
中科院分区：
文献类型：
--
作者：
ASHMEAD, DH;DAVIS, DL;ODOM, RD
研究了两耳时差在婴儿声音定位中的作用。一项关于自由场声音定位的实验证实了先前的发现，即最小可听角在出生后的前半年结束时发生了实质性变化，3项实验探讨了该年龄范围内的耳间时间辨别。这3个实验中的第一个使用了自适应心理物理程序，表明婴儿在声音偏侧化任务中做出了适当的反应，该任务提供了对耳间时间辨别的直接测量。另外2个实验通过考虑任务中表现的最高水平来改进心理物理过程。16、20和28周的婴儿的阈值在50到75微秒之间，没有明显的年龄差异。这些阈值远低于自由场声音定位研究的预测，表明对耳间时间差的敏感性不是该年龄段声音定位精度的限制因素。相反，自由场声音定位中与年龄相关的变化可能反映出需要整合不同的定位线索并校准由于头部生长而导致的线索的变化值。
The role of interaural time differences in infants' sound localization was investigated. One experiment on free-field sound localization corroborated previous findings that the minimum audible angle changes substantially toward the end of the first half year after birth, and 3 experiments explored interaural time discrimination in that age range. The first of these 3 experiments used an adaptive psychophysical procedure, showing that infants responded appropriately in a sound lateralization task that provides a direct measure of interaural time discrimination. The other 2 experiments improved on the psychophysical procedure by taking into account the ceiling level on performance in the task. Infants aged 16, 20, and 28 weeks had thresholds in the range of 50 to 75 microsec, with no apparent age difference. These thresholds were much lower than would be predicted from studies of free-field sound localization, indicating that sensitivity to interaural time differences is not a limiting factor for the precision of sound localization in this age range. Instead, age-related changes in free-field sound localization may reflect the need to integrate across different localization cues and to calibrate the changing values of cues due to head growth.