Current Studies

An overview of the current studies in the Adoption Research Cluster.

A Longitudinal Study of Adoption, Attachment, and Problem Behaviour

In a prospective, longitudinal study, starting at 6 months of age, maternal sensitivity, early infant-mother attachment and competence were studied in 160 infants adopted from Sri Lanka, South Korea and Colombia. At age 7, a follow-up of the 160 children, plus 30 adoptees recruited at this age, was completed; the attrition rate appeared to be low (8%). In a second follow up at the age of 14 years the adoptive families and the adolescent adoptees have been visited. In the near future a new follow-up studie at 21 years of age will be conducted. In the follow-up studies, the adjustment of the adoptees has been assessed, including their cognitive development (IQ and school achievement), their socioemotional functioning (e.g. peer group morality), and their problem behaviour.


Staff

Financial support

The Leiden longitudinal study of adoption has been supported by:

  • Dutch Ministry of Education (early-childhood study)
  • Preventiefonds (early-childhood study)
  • Dutch Ministry of Welfare (early-childhood study)
  • Netherlands Organization for Scientific Research (Dutch)
    (NWO grant 575-87-701; middle-childhood study)
  • Leiden University (adolescence study)
  • Wereldkinderen (Dutch)                                 
    (adolescence study)
  • Stichting Kind en Toekomst (Dutch)
    (adolescence study)

Key publications

  • Juffer, F., & Van IJzendoorn, M.H. (2007). A longitudinal study of Korean adoptees in the Netherlands: Infancy to middle childhood. In K.J.S. Bergquist, M.E., Vonk, D.S., Kim, & M.D. Feit (Eds.), International Korean adoption. A fifity-year history of policy and practice (pp. 263-276). Binghamton, NY: Haworth Press.
  • Jaffari-Bimmel, N., Juffer, F., Van IJzendoorn, M.H., Bakermans-Kranenburg, M.J., & Mooijaart, A. (2006). Social Development from Infancy to Adolescence: Longitudinal and Concurrent Factors in an Adoption Sample. Developmental Psychology, 42, 1143-1153.
  • Juffer, F. (2006). Children's awareness of adoption and their problem behavior in families with 7-year-old internationally adopted children. Adoption Quarterly, 9 (2/3), 1-22.
  • Juffer, F., Bakermans-Kranenburg, M.J., & Van IJzendoorn, M.H. (2005). The importance of parenting in the development of disorganized attachment: Evidence from a preventive intervention study in adoptive families. Journal of Child Psychology and Psychiatry, 46, 263-274.
  • Juffer, F., Stams, G.J.J.M., & Van IJzendoorn, M.H. (2004). Adopted children's problem behavior is significantly related to their ego resiliency, ego control, and sociometric status. Journal of Child Psychology and Psychiatry, 45, 697-706.
  • Stams, G.J.J.M., Juffer, F., & Van IJzendoorn, M.H. (2002). Maternal sensivity, infant attachment, and temperament predict adjustment in middle childhood: The case of adopted children and their biologically unrelated parents. Developmental Psychology, 38, 806-821.

Adoption Meta-Analysis Project (Adoption MAP)

The aim of the Adoption Meta-Analysis Project is to examine adopted children's adjustment and development in a series of meta-analysis.


Staff

Financial support

Key publications

  • Juffer, F., & Van IJzendoorn, M.H. (2007). Adoptees do not lack self-esteem: A meta-analysis of studies on self-esteem of transracial, international, and domestic adoptees. Psychological Bulletin, 133, 1067-1083.
  • Van IJzendoorn, M.H., Bakermans-Kranenburg, M.J., & Juffer, F. (2007). Plasticity of growth in height, weight and head circumference: Meta-analytic evidence of massive catch-up after international adoption. Journal of Developmental and Behavioral Pediatrics, 28, 334-343.
  • Van IJzendoorn, M.H., & Juffer, F. (2006). The Emanuel Miller Memorial Lecture 2006. Adoption as intervention. Meta-analytic evidence for massive catch-up and plasticity in physical, socio-emotional, and cognitive development. Journal of Child Psychology and Psychiatry, 47, 1228-1245.
  • Juffer, F., & Van IJzendoorn, M.H. (2005). Behavior problems and mental health referrals of international adoptees: A meta-analysis. JAMA - The Journal of the American Medical Association, 293, 2501-2515.
  • Van IJzendoorn, M.H., & Juffer, F. (2005). Adoption is a successful natural intervention enhancing adopted children's IQ and school performance. Current Directions in Psychological Science, 14, 326-330.
  • Van IJzendoorn, M.H., Juffer, F., & Klein Poelhuis, C.W. (2005). Adoption and cognitive development: A meta-analytic comparison of adopted and non-adopted children's IQ and school performance. Psychological Bulletin, 131, 301-316.

Attachment in Adoptive Families

The aim of this project is to study adopted children's attachment security and its determinants and consequences.


Staff

Financial support

Netherlands Organization for Scientific Research (NWO) (Dutch)

Key publications

  • Van Londen, W.M., Juffer, F., & Van IJzendoorn, M.H. (2007). Attachment, cognitive and motor development in adopted children: Short-term outcomes after international adoption. Journal of Pediatric Psychology, 32, 1259-1263.
  • jaffari-Bimmel, N., Juffer, F., Van IJzendoorn, M.H., Bakermans-Kranenburg, M.J., & Mooijaart, A. (2006). Social Development from Infancy to Adolescence: Longitudinal and Concurrent factors in an Adoption Sample. Developmental Psychology, 42, 1143-1153.
  • Juffer, F., Bakermans-Kranenburg, M.J., & Van IJzendoorn, M.H. (2005). The importance of parenting in the development of disorganized attachment: Evidence from a preventive intervention study in adopotive families. Journal of Child Psychology and Psychiatry, 46, 263-274.
  • Stams, G.J.J.M., Juffer, F., & Van IJzendoorn, M.H. (2002). Maternal sensitivity, infant attachment, and temperament predict adjustment in middle childhood: The case of adopted children and their biologically unrelated parents. Developmental Psychology, 38, 806-821.

Adjustment and development of international adoptees

In this project the adjustment and development of children adopted from China and from India are examined through large-scale surveys.


Staff

Financial Support

key publications

Juffer, F., & Tieman, W. (2007, March 31). Internationally adopted girls from China: Child behavior problems and parents' investment in Chinese culture. Paper presented at the 2007 Biennial Meeting of the Society for Research in Child Development, Boston, USA.

Children Adopted from Children's Home Metera (Greece)

The aim of this project is to study children's attachment security and competence during and after institutional care in children's home Metera in Greece.

Staff

Key publications

  • Vorria, P., Papaligoura, Z., Dunn, J., Van IJzendoorn, M.H., Steele, H., Kontopoulou, A. et al. (2003). Early experiences and attachment relationships of Greek infants raised in residential group care. Journal of Child Psychology and Psychiatry, 44, 1208-1220.
  • Vorria, P., Papaligoura, Z., Sarafidou, J., Kopakaki, M., Dunn, J., Van IJzendoorn, M.H., et al. (2006). The development of adopted children after institutional care: A follow-up study. Journal of Child Psychology and Psychiatry, 47, 1246-1253.

Last Modified: 19-08-2013