Roberts B, Bailey P J
Department of Psychology, University of York, Heslington, England.
J Acoust Soc Am. 1993 Dec;94(6):3165-77. doi: 10.1121/1.407222.
A single even-numbered harmonic can be segregated from an odd-harmonic complex more easily than its odd-numbered neighbors, for low fundamentals [Roberts and Bregman, J.Acoust. Soc. Am. 90, 3050-3060 (1991)]. It has been proposed that this effect occurs because the even harmonic is inconsistent with the regular spectral pattern formed by the odd harmonics. However, in this study we evaluate some alternative accounts of the effect. The stimuli were harmonic complex tones for which one of the components was cued by a preceding pure tone. Subjects were required to listen for the cued component and either to rate its clarity (experiments 1 and 3) or to judge its pitch in relation to the preceding tone (experiment 2). It is argued that the weaker fusion of an added even harmonic depends on its status as an added component rather than as an even harmonic (experiment 1), and on its immediate perceptual salience rather than on auditory learning. An even-odd difference was also found when even and odd harmonics were tested in an identical spectral context (experiment 2), and when one of the neighboring odd harmonics was removed (experiment 3). These results are consistent with the proposal that it is easier to segregate a harmonic from a periodic complex tone when it does not form part of the regular pattern of spectral spacing defined by the other harmonics.
对于低频基频而言，单个偶数次谐波比其相邻的奇数次谐波更容易从奇次谐波复合体中分离出来[罗伯茨和布雷格曼，《美国声学学会杂志》90, 3050 - 3060(1991)]。有人提出这种效应的发生是因为偶数次谐波与奇数次谐波形成的规则频谱模式不一致。然而，在本研究中，我们评估了该效应的一些其他解释。刺激声是谐波复合音，其中一个成分由之前的纯音进行提示。要求受试者聆听被提示的成分，并对其清晰度进行评分(实验1和3)，或者判断其音高与前一个音的关系(实验2)。有人认为，添加的偶数次谐波较弱的融合取决于其作为添加成分的状态，而非作为偶数次谐波的状态(实验1)，并且取决于其即时的感知显著性，而非听觉学习。当偶数次谐波和奇数次谐波在相同的频谱背景下进行测试时(实验2)，以及当相邻的奇数次谐波之一被去除时(实验3)，也发现了偶数 - 奇数差异。这些结果与以下观点一致，即当一个谐波不是由其他谐波定义的规则频谱间距模式的一部分时，从周期性复合音中分离该谐波会更容易。
