Diesch E, Iverson P, Kettermann A, Siebert C
Institut Für Medizinische Psychologie und Verhaltensneurobiologie, Universität Tübingen, Germany.
Psychol Res. 1999;62(1):1-19. doi: 10.1007/s004260050036.
In a study of the internal category structure of the vowel /i/, Kuhl found a "perceptual magnet effect": Discrimination sensitivity was poorer for category instances that were acoustically similar to the category prototype than it was for category instances that were not. The typicality of category exemplars was determined by goodness judgments and was found to correlate with the acoustics of average production. Analysis and interpretation of discrimination performance relied on two important assumptions: that listeners perceived all stimuli presented as exemplars of the same vowel category and that, apart from the influence of phonetic coding, discrimination sensitivity was the same across the investigated part of the vowel space. In the present study, it is shown that production and perception estimates of the category prototype may diverge, possibly because listeners seem to prefer hyperarticulated variants of vowel categories. An approach towards measurement of intra-category discrimination minima is put forward and tested that protects against intercategory confounds and avoids the isosensitivity assumption.
在一项关于元音/i/内部类别结构的研究中，库尔发现了一种“感知磁体效应”：与类别原型在声学上相似的类别实例的辨别敏感度，比那些不相似的类别实例要低。类别范例的典型性由优劣判断决定，并发现与平均发音的声学特征相关。辨别表现的分析和解释依赖于两个重要假设：听众将呈现的所有刺激都感知为同一元音类别的范例，并且除了语音编码的影响外，在元音空间的研究范围内辨别敏感度是相同的。在本研究中，结果表明类别原型的发音和感知估计可能存在差异，这可能是因为听众似乎更喜欢元音类别的过度清晰变体。本文提出并测试了一种测量类别内辨别最小值的方法，该方法可防止类别间的混淆并避免等敏感度假设。
