The cognitive test scores of 20 second-born children who had participated in an early education project since birth were compared to those of their nonparticipant older siblings. The McCarthy Scales of Children's Abilities were administered to all of the children prior to entering kindergarten. Contrary to the expected effects of birth order, the program children consistently scored higher than their older siblings on all subtests as well as the General Cognitive Index. The advantages for second-born children, which were not seen among sibling pairs in a comparison group, suggest the positive effects of early education.
References
1.
AdamsB. N.Birth order: a critical review. Sociometry, 1972, 35, 411–439.
2.
GaltonF.English men of science: their nature and nurture. London: Macmillan, 1874.
3.
HiltonI.Differences in the behavior of mothers towards first- and later-born children. Journal of Personality and Social Psychology, 1967, 7, 282–290.
4.
HuntJ. McV.Intelligence and experience. New York: Ronald, 1961.
5.
KarnesM. B.TesksJ. A.HodginsA. S.BadgerE. D.Education intervention at home by mothers of disadvantaged infants. Child Development, 1970, 41, 925–935.
6.
KochH. L.The relationship of primary mental abilities in five- and six-year-olds to sex of child and characteristics of his sibling. Child Development, 1954, 25, 209–223.
7.
MaddenJ.LevensteinP.LevensteinS.Longitudinal IQ outcomes of the Mother-Child Home Program. Child Development, 1976, 47, 1015–1025.
8.
PiersonD. E.The Brookline program for infants and their families: the first operational year. Brookline, MA: The Brookline Early Education Project, 1973.
9.
RosenbergB. G.Sutton-SmithB.The relationship of ordinal position and sibling sex status to cognitive abilities. Psychonomic Science, 1964, 1, 81–82.
10.
WhiteB. L.KabanB. T.AttanucciJ. S.The origins of human competence: the final report of the Harvard Preschool Project. Lexington, MA: Lexington Books, 1979.
11.
ZajoncR. B.MarkusG. B.Birth order and intellectual development. Psychological Review, 1975, 82, 74–88.
