Li X, Pastore R E
Department of Psychology, State University of New York at Binghamton 13901, USA.
J Acoust Soc Am. 1995 Oct;98(4):1956-68. doi: 10.1121/1.413315.
The current study investigated perceptual constancy for spectral slope discrimination when fundamental frequency (F0) and spectral shape were varied across three complex stimuli within a single trial. The three stimulus variables were global or emergent properties of a complex sound. The selection of the stimulus variables was in keeping with notions that perception may be organized in terms of a source-filter model of complex sound production; F0 and spectral slope represent properties of sound sources and spectral shape typically represents a filter property. According to the source-filter model, interaction between stimulus properties should depend upon whether the typical origin of the property was common to the source spectrum or the filter transfer function. The four experiments in the current study demonstrated a significant performance decrement in spectral slope discrimination when F0 (a second source property) varied. However, spectral slope discrimination was minimally altered when spectral shape (a filter property) was varied. The study supported claims that listeners treat source properties as a unit which, in perception, is relatively independent of filter properties.
当前的研究考察了在单个试验中，当基频（F0）和频谱形状在三种复杂刺激中变化时，频谱斜率辨别中的知觉恒常性。这三个刺激变量是复杂声音的全局或涌现属性。刺激变量的选择符合这样的观念，即知觉可能是按照复杂声音产生的源-滤波器模型来组织的；F0和频谱斜率代表声源的属性，而频谱形状通常代表滤波器属性。根据源-滤波器模型，刺激属性之间的相互作用应取决于该属性的典型起源是声源频谱还是滤波器传递函数所共有的。当前研究中的四个实验表明，当F0（第二个声源属性）变化时，频谱斜率辨别性能显著下降。然而，当频谱形状（一个滤波器属性）变化时，频谱斜率辨别变化极小。该研究支持了这样的观点，即听众将声源属性视为一个单元，在知觉中，该单元相对独立于滤波器属性。
