测量英语发音中元音感知差异的最小可辨距离，揭示语音控制精度。
Measurement of the Granularity of Vowel Production Space By Just Producible Different (JPD) Limens
- 通过模仿实验测定元音在听觉空间中的最小可辨差（JPD）
- JPD范围为14至51米尔斯，反映发音控制精度
- 为语音产生理论和元音系统结构提供心理物理依据
过去数十年的研究表明，人类元音发音的复杂协调动作至少部分由听觉空间中的目标区域控制。在亚音位层面也存在控制机制，但其精确度未知。本文通过元音模仿任务，首次测量了英语母语者在发前元音时的‘最小可辨差异’（JPD）。结果表明，在F1×F2听觉空间中，两个元音刺激需至少相距14至51米尔斯才能被可靠区分。这一发现对情景式语音产生理论具有启示意义，并通过设定元音音位在发音空间中的最小间距下限，解释了语音系统中元音数量与分布模式的心理物理基础。
原文摘要 · Abstract (English)
A body of work over the past several decades has demonstrated that the complex and coordinated articulatory movements of human vowel production are governed (at least in part)by control mechanisms whose targets are regions of auditory space. Within the target region control at the sub-phonemic level has also been demonstrated. But the degree of accuracy of that control is unknown. The current work investigates this question by asking how far apart must two vowel stimuli lie in auditory space in order to yield reliably different imitations? This distance is termed 'Just Producible Difference' (JPD). The current study uses a vowel mimicry paradigm to derive the first measurement of JPD among two sets of English speakers during front vowel production. JPD is estimated at between 14 and 51 mels in F1 X F2 space. This finding has implications for episodic theories of speech production. It also clarifies the possible structures of human vowel systems, by setting a theoretical lower bound for how close two vowel phonemes may be in a speaker's formant space, and hence a psychophysical explanation of observed trends in number and patterns of possible vowel phonemes.
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