Relative Effectiveness of Three Stimulus Variables for Locating a Moving Sound Source
Relative Effectiveness of Three Stimulus Variables for Locating a Moving Sound Source
复制标题
三个刺激变量定位移动声源的相对有效性
作者：
L. Rosenblum;C. Carello;R. Pastore
一项研究表明，观察者可以使用至少三种类型的声学变量来可靠地指示移动声源何时通过：耳间时间差异、多普勒效应和幅度变化。这些变量中的每一个都是单独呈现的，并且每个变量都成功地指示了（模拟的）移动声源何时经过观察者。这三个变量进行了竞争（每个变量都表明最接近的通道发生在不同的时间），以确定它们的相对重要性。研究发现，振幅变化主导了耳间时间差异，而耳间时间差异反过来又主导了多普勒效应刺激变量。结果通过两种解释进行讨论。首先，受试者的判断可能基于每个刺激变量的潜在可辨别性。然而，由于所使用的刺激涉及易于辨别的变化，因此受试者可能会根据刺激变量与不同环境条件的独立性来做出判断。获得的优势排序支持第二种解释。
A study is reported in which it is shown that observers can use at least three types of acoustic variables that indicate reliably when a moving sound source is passing: interaural temporal differences, the Doppler effect, and amplitude change. Each of these variables was presented in isolation and each was successful in indicating when a (simulated) moving sound source passed an observer. These three variables were put into competition (with each indicating that closest passage occurred at a different time) in an effort to determine their relative importance. It was found that amplitude change dominated interaural temporal differences which, in turn, dominated the Doppler effect stimulus variable. The results are discussed in terms of two interpretations. First, it is possible that subjects based their judgements on the potential discriminability of each stimulus variable. However, because the stimuli used involved easily discriminable changes, subjects may instead have based their judgements on the independence of a stimulus variable from different environmental situation conditions. The dominance ordering obtained supports the second interpretation.