This study presents the acquisition of the tonic and pre-tonic vowels in Brazilian Portuguese (BP) by three children aged from 1;0 to 3;5, assuming the Contrastive Hierarchy Theory (CHT) (Dresher 2003, 2009). We address three issues regarding acquisition within the CHT: variability, phonological processes and restructuring. Results indicate that children may take different paths in acquiring segmental phonology and restructure their built structure if it does not account for the phonological processes found in the language they are exposed to.

中文翻译：

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用巴西葡萄牙语获取补语和前补语元音

这项研究提出了三个年龄介于1; 0至3; 5的孩子在巴西葡萄牙语（BP）中获取的补语和前补语元音（假设对比层次理论（CHT））（Dresher 2003，2009）。我们解决了CHT中与获取有关的三个问题：可变性，语音过程和重组。结果表明，如果儿童不了解他们所使用的语言中的语音过程，则他们可能会采取不同的途径来获取分段音系并重建其结构。