Spence Melanie J, Moore David S
Box 830688, GR 4.1, The University of Texas at Dallas, Richardson 75083-0688, USA.
Dev Psychobiol. 2003 Jan;42(1):97-109. doi: 10.1002/dev.10093.
To extend a previous finding that 6-month-old infants categorized low-pass filtered infant-directed (ID) utterances, we examined a) 6-month-old infants' categorization of more naturalistic, unfiltered ID utterances and b) the developmental progression of ID-speech categorization. In Experiment 1, 6-month-olds heard seven different unfiltered tokens from one class of ID utterance (approving or comforting), followed by a novel token from either the same or an unfamiliar category. Infants recovered, responding only to the unfamiliar category token, suggesting that they categorized naturalistic ID utterances. Four-month-olds' categorization of filtered and unfiltered versions of the ID utterances was assessed in Experiments 2 and 4. Four-month-olds did not recover, responding to a test token from an unfamiliar class, suggesting that they did not categorize either filtered or unfiltered ID utterances. Experiment 3 demonstrated that 4-month-old infants' failure to categorize did not result from their inability to complete the procedure. These results suggest that infants' processing of ID speech changes from 4 to 6 months of age.
为了扩展之前的一项研究发现，即6个月大的婴儿能够对低通滤波的婴儿导向（ID）话语进行分类，我们考察了：a）6个月大婴儿对更自然、未滤波的ID话语的分类；b）ID语音分类的发展进程。在实验1中，6个月大的婴儿听了来自一类ID话语（赞许或安慰）的7个不同的未滤波样本，然后是来自同一类别或不熟悉类别的一个新样本。婴儿恢复了反应，只对不熟悉类别的样本做出反应，这表明他们对自然的ID话语进行了分类。在实验2和4中评估了4个月大婴儿对ID话语的滤波和未滤波版本的分类。4个月大的婴儿没有恢复反应，对来自不熟悉类别的测试样本做出了反应，这表明他们没有对滤波或未滤波的ID话语进行分类。实验3表明，4个月大婴儿未能进行分类并非由于他们无法完成该程序。这些结果表明，婴儿对ID语音的处理在4到6个月大时发生了变化。
