Adams J L, Ramey C T
Child Dev. 1980 Dec;51(4):1280-4.
Mother-infant dyads (N = 27) were seen as part of a longitudinal study of lower-socioeconomic-status infants at high but varying risk for mild mental retardation. A 20-min unstructured interaction session was videotaped in a laboratory setting when the infants were 6 months old. Transcriptions were made of mothers' speech to their infants. Measures of maternal language included sentence form, amount of speech, and syntactic complexity. It was found that the proportion of imperatives, but not the amount of maternal speech, was positively correlated with a composite measure of risk status (High Risk Index) and negatively correlated with maternal education and WAIS IQ. Similar to previous findings for maternal speech to older infants, syntactic complexity was not significantly related to social risk indices. In terms of descriptive aspects of the data, there was a high degree of variability on the language measures-indicative of wide individual differences in maternal language style.
母婴二元组（N = 27）是一项针对社会经济地位较低、有轻度智力发育迟缓高风险但风险程度各异的婴儿的纵向研究的一部分。当婴儿6个月大时，在实验室环境中对一段20分钟的无结构化互动环节进行了录像。记录了母亲对婴儿说话的内容。母亲语言的测量指标包括句子形式、言语量和句法复杂性。研究发现，祈使句的比例与风险状况综合指标（高风险指数）呈正相关，与母亲教育程度和韦氏成人智力量表智商呈负相关，而母亲的言语量则不然。与之前关于母亲对较大婴儿说话的研究结果相似，句法复杂性与社会风险指数没有显著关系。在数据的描述方面，语言测量指标存在高度变异性，这表明母亲语言风格存在广泛的个体差异。
