Faculty of Human Informatics, Aichi Shukutoku University, Japan.
J Acoust Soc Am. 2010 Oct;128(4):2049-58. doi: 10.1121/1.3458847.
The theory of relational acoustic invariance [Pickett, E. R., et al. (1999). Phonetica 56, 135-157] was tested with the Japanese stop quantity distinction in disyllables spoken at various rates. The questions were whether the perceptual boundary between the two phonemic categories of single and geminate stops is invariant across rates, and whether there is a close correspondence between the perception and production boundaries. The durational ratio of stop closure to word (where the "word" was defined as disyllables) was previously found to be an invariant parameter that classified the two categories in production, but the present study found that this ratio varied with different speaking rates in perception. However, regression and discriminant analyses of perception and production data showed that treating stop closure as a function of word duration with an intercept term represented the perception and production boundaries very well. This result indicated that the durational ratio of adjusted stop closure (i.e., closure with an added constant) to the word was invariant and distinguished the two phonemic categories clearly. Taken together, the results support the relational acoustic invariance theory, and help refine the theory with regard to exactly what form 'invariance' can take.
关系声学不变性理论[Pickett, E. R., 等人。(1999)。语音学 56, 135-157]用不同速度说出的双音节日语塞音数量区别进行了检验。问题是在两种语音类别（单塞音和复塞音）之间，感知边界是否在速度上不变，以及感知和产生边界之间是否存在密切对应关系。之前的研究发现，塞音闭段与单词（“单词”定义为双音节）的时长比是一个不变的参数，可以在产生时对这两个类别进行分类，但本研究发现，在感知中，这个比率随不同的说话速度而变化。然而，感知和产生数据的回归和判别分析表明，将塞音闭段作为单词持续时间的函数，并带有一个截距项，很好地表示了感知和产生的边界。这一结果表明，调整后的塞音闭段（即加上常数的闭段）与单词的时长比是不变的，可以清晰地区分两个音位类别。总的来说，这些结果支持关系声学不变性理论，并有助于进一步完善该理论，明确“不变性”的具体形式。
