Kilbride H W, Johnson D L, Streissguth A P
Child Dev. 1977 Dec;48(4):1686-8.
Early home experiences of a group of 32 2-week old infants, equally divided according to social class, birth order, and sex, were studied. Naturalistic observations were taken on 2 consecutive days for a total of 6 hours. Compared with later-borns, firstborns received significantly more caretaker interaction on all variables studied. Compared with lower-SES infants, those from higher-SES homes received significantly more direct verbal interaction although the 2 groups did not differ on total periods of other types of caretaking interaction. The findings are consistent with birth order and social class differences reported in home environments of older infants and children.
对一组32名两周大的婴儿进行了早期家庭经历研究，这些婴儿根据社会阶层、出生顺序和性别平均分成了几组。连续两天进行自然观察，总计6小时。与后出生的婴儿相比，头胎出生的婴儿在所有研究变量上得到的照顾者互动显著更多。与社会经济地位较低的婴儿相比，来自社会经济地位较高家庭的婴儿得到的直接言语互动显著更多，尽管两组在其他类型照顾互动的总时长上没有差异。这些发现与年龄较大的婴儿和儿童家庭环境中报告的出生顺序和社会阶层差异一致。
