On the robustness of vocal development: an examination of infants with moderate-to-severe hearing loss and additional risk factors.
On the robustness of vocal development: an examination of infants with moderate-to-severe hearing loss and additional risk factors.
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DOI：
10.1044/1092-4388(2007/099
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Suneeti Nathani;D. Kimbrough Oller;A. Rebecca Neal
中科院分区：
文献类型：
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作者：
Suneeti Nathani;D. Kimbrough Oller;A. Rebecca Neal
10个月大时开始的典型牙牙学语在婴儿期惊人地强劲，这表明一定有深层的生物力量保持这种关键的发声能力的发展。本研究进一步评估了规范的咿呀学语和其他方面的语言前声乐发展的鲁棒性。方法对4例因双侧中重度感音神经性耳聋及其他发育迟缓危险因素而有发声发育异常风险的婴儿进行纵向观察。结果两个婴儿在典型的婴儿咿呀学语的发病延迟，并表现出更大的波动，典型咿呀学语的比率比典型的发展婴儿。在相同的措施，其余2名婴儿在正常范围内，虽然他们的典型的咿呀学语的发病年龄晚于典型发育的婴儿的平均值。容量与正常发育的婴儿没有明显差异。然而，在不同时间产生的各种前语言音节类型的比例上，观察到了与典型发育中的婴儿的差异。结论结果提供了进一步的证据，规范的咿呀学语的鲁棒性，并表明需要一个大的参数研究评估不同程度的听力损失和其他危险因素对发声发展的影响。
PURPOSE Onset of canonical babbling by 10 months of age is surprisingly robust in infancy, suggesting that there must be deep biological forces that keep the development of this key vocal capability on course. This study further evaluated the robustness of canonical babbling and other aspects of prelinguistic vocal development. METHOD Longitudinal observation was conducted on 4 infants who were at risk for abnormal vocal development because of bilateral moderate-to-severe sensorineural hearing loss and additional risk factors for developmental delay. RESULTS Two of the infants were delayed in the onset of canonical babbling and showed greater fluctuation in canonical babbling ratios following its onset than did typically developing infants. On the same measures, the remaining 2 infants were within normal limits, although their age of onset for canonical babbling was later than the mean for typically developing infants. Volubility was not notably different from typically developing infants. Differences from typically developing infants were, however, observed in proportions of various prelinguistic syllable types produced across time. CONCLUSION Results provided further evidence of robustness of canonical babbling and indicated the need for a large parametric study evaluating effects of varying degrees of hearing loss and other risk factors on vocal development.