Evidence for precategorical extrinsic vowel normalization
Evidence for precategorical extrinsic vowel normalization
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DOI：
10.3758/s13414-012-0408-7
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发表时间：
2013-04-01
影响因子：
1.7
通讯作者：
Mitterer, Holger
中科院分区：
文献类型：
--
作者：
Sjerps, Matthias J.;McQueen, James M.;Mitterer, Holger
三个实验研究了外在元音标准化是否主要发生在分类或预分类处理级别。实验 1 中复制了分类中的传统元音归一化效果：当在 F (1) 升高的环境中听到元音时，取自 [E-a]-ε] 连续体的元音通常被解释为 /E-a/（其第一共振峰 F (1) 较低），而不是在 F (1) 降低的环境中听到。这是在仅由两个音节组成的上下文中建立的。这些简短的上下文对于实验 2 是必要的，实验 2 是一项辨别任务，鼓励听众在分类前的水平上关注元音的感知属性。元音归一化再次被发现：在高 F (1) 上下文中，从端点 [epsilon] 比从端点 [E-a] 更容易区分歧义元音，而在低 F (1) 上下文中则相反。实验 3 测量了沿 [E-a]-ε 连续体的各对步骤之间的可辨别性。再次发现了情境影响，但没有出现歧视峰值，这与从相同参与者的分类行为中预测的结果相反。因此，外在元音标准化似乎是一个至少部分发生在预分类处理级别的过程。
Three experiments investigated whether extrinsic vowel normalization takes place largely at a categorical or a precategorical level of processing. Traditional vowel normalization effects in categorization were replicated in Experiment 1: Vowels taken from an [E-a]-[epsilon] continuum were more often interpreted as /E-a/ (which has a low first formant, F (1)) when the vowels were heard in contexts that had a raised F (1) than when the contexts had a lowered F (1). This was established with contexts that consisted of only two syllables. These short contexts were necessary for Experiment 2, a discrimination task that encouraged listeners to focus on the perceptual properties of vowels at a precategorical level. Vowel normalization was again found: Ambiguous vowels were more easily discriminated from an endpoint [epsilon] than from an endpoint [E-a] in a high-F (1) context, whereas the opposite was true in a low-F (1) context. Experiment 3 measured discriminability between pairs of steps along the [E-a]-[epsilon] continuum. Contextual influences were again found, but without discrimination peaks, contrary to what was predicted from the same participants' categorization behavior. Extrinsic vowel normalization therefore appears to be a process that takes place at least in part at a precategorical processing level.