Marklund Ellen, Marklund Ulrika, Gustavsson Lisa
Phonetics Laboratory, Stockholm Babylab, Department of Linguistics, Stockholm University, Stockholm, Sweden.
Division of Sensory Organs and Communication, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden.
Front Psychol. 2021 Jul 19;12:693866. doi: 10.3389/fpsyg.2021.693866. eCollection 2021.
Extreme or exaggerated articulation of vowels, or vowel hyperarticulation, is a characteristic commonly found in infant-directed speech (IDS). High degrees of vowel hyperarticulation in parent IDS has been tied to better speech sound category development and bigger vocabulary size in infants. In the present study, the relationship between vowel hyperarticulation in Swedish IDS to 12-month-old and phonetic complexity of infant vocalizations is investigated. Articulatory adaptation toward hyperarticulation is quantified as difference in vowel space area between IDS and adult-directed speech (ADS). Phonetic complexity is estimated using the Word Complexity Measure for Swedish (WCM-SE). The results show that vowels in IDS was more hyperarticulated than vowels in ADS, and that parents' articulatory adaptation in terms of hyperarticulation correlates with phonetic complexity of infant vocalizations. This can be explained either by the parents' articulatory behavior impacting the infants' vocalization behavior, the infants' social and communicative cues eliciting hyperarticulation in the parents' speech, or the two variables being impacted by a third, underlying variable such as parents' general communicative adaptiveness.
元音的极度或夸张发音，即元音过度清晰发音，是婴幼儿指向性言语（IDS）中常见的一个特征。父母的IDS中高度的元音过度清晰发音与婴儿更好的语音类别发展和更大的词汇量有关。在本研究中，我们调查了瑞典语IDS中元音过度清晰发音与12个月大婴儿发声的语音复杂性之间的关系。对过度清晰发音的发音适应程度通过IDS与成人指向性言语（ADS）之间元音空间区域的差异来量化。语音复杂性使用瑞典语单词复杂性度量（WCM-SE）进行估计。结果表明，IDS中的元音比ADS中的元音发音更清晰，并且父母在过度清晰发音方面的发音适应与婴儿发声的语音复杂性相关。这可以通过以下方式来解释：要么是父母的发音行为影响了婴儿的发声行为，要么是婴儿的社交和交流线索引发了父母言语中的过度清晰发音，要么是这两个变量受到第三个潜在变量（如父母的一般交流适应性）的影响。
