A cross tone-language perceptual assimilation study investigated native categorisations and goodness ratings of non-native Thai tones by Thai-naive listeners differing in their native tone systems: Mandarin, Northern Vietnamese and Southern Vietnamese. We derived hypotheses from the Perceptual Assimilation Model (PAM: Best, 1995), which considers both native phonological and phonetic influences on perceptual assimilation of non-native speech contrasts. Mandarin listeners reliably categorised the Thai mid level tone to their single native level tone category, reflecting a native phonological effect, but they also showed high residual phonetic sensitivity to differences between the non-native tone and the native tone it was assimilated to, indicated by low category-goodness ratings. Native phonological and phonetic differences in tones of the two Vietnamese dialects also affected perceptual assimilation of the Thai high level and rising tones. In addition, categorisation responses were faster overall for Categorised than Uncategorised assimilations, revealing the processing cost of perceptual uncertainty due to phonological competition among and/or phonetic discrepancies from multiple native categories. This indicates, furthermore, a more focused and thus stronger native phonological contribution for Categorised than Uncategorised assimilations. PAM principles thus extend to non-native tone assimilations and indicate the importance of both native phonological and phonetic contributions to non-native speech perception.

一项跨语言听觉同化研究研究了天真的，北越南语和南越南语本国音调系统不同的泰国天真的听众对非本国泰语的本地分类和优劣等级的影响。我们从感知同化模型（PAM：Best，1995）中得出假设，该模型考虑了非自然语音对比的感知同化中的语音和语音影响。普通话听众将泰语中级音调可靠地分类为他们的单个母语音调类别，这反映了母语的语音效果，但他们还表现出对非母语音调和与其同化的母语音调之间的差异的较高残留语音敏感性，如下所示：低类别商品等级。两种越南方言语调之间的本地语音和语音差异也影响了泰国高音和上升声调的感知同化。此外，归类归类的分类响应总体上比未归类同化要快，这表明由于多个本地类别之间的语音竞争和/或语音差异引起的感知不确定性的处理成本。此外，这表明与未归类同化相比，归化归类对本地语音的贡献更集中，因而更强。因此，PAM原理扩展到了非本地音同化，并指出了本地语音和语音对非本地语音感知的重要性。与未分类同化相比，分类归类的分类响应总体上更快，这表明由于多个本地类别之间的语音竞争和/或语音差异，导致了感知不确定性的处理成本。此外，这表明与未归类同化相比，归化归类对本地语音的贡献更集中，因而更强。因此，PAM原理扩展到了非本地音同化，并指出了本地语音和语音对非本地语音感知的重要性。与未分类同化相比，分类归类的分类响应总体上更快，这表明由于多个本地类别之间的语音竞争和/或语音差异，导致了感知不确定性的处理成本。此外，这表明与未归类同化相比，归化归类对本地语音的贡献更集中，因而更强。因此，PAM原理扩展到了非本地音同化，并指出了本地语音和语音对非本地语音感知的重要性。与未归类同化相比，归类对归类的音韵贡献更大，因而更强。因此，PAM原理扩展到了非本地音同化，并指出了本地语音和语音对非本地语音感知的重要性。与未归类同化相比，归类对归类的音韵贡献更大，因而更强。因此，PAM原理扩展到了非本地音同化，并指出了本地语音和语音对非本地语音感知的重要性。