Wave 2 of the Middle Childhood Cohort consisted of an online questionnaire and a home visit in which participants were observed by researchers while performing several tasks. Additionally, physiological samples were taken (e.g., hair samples). Participants were also asked to take measurements on their own at home for several days after the home visit. Furthermore, to experimentally examine social enrichment, we included a parenting intervention, which allows us to investigate causal effects of parenting on social development. Between the 2nd and 3rd measurement, 40% of the sample received a video feedback intervention to promote positive parenting and sensitive discipline (VIPP-SD).

Subject age
  • 8.0 - 9.0 years
Time span From 2016-08-21 to 2018-01-24
Geographic location NL
Marinus van IJzendoorn
Leiden University, Erasmus University Rotterdam, University of Cambridge
Eveline Crone
Leiden University, Erasmus University Rotterdam
Marian Bakermans-Kranenburg
Leiden University, Vrije Universiteit Amsterdam
Rutger Engels
Leiden University, Erasmus University Rotterdam
Michelle Achterberg
Leiden University, Erasmus University Rotterdam
Mara van der Meulen
Leiden University
Simone Dobbelaar
Leiden University, Erasmus University Rotterdam
Debby van Hees
Elisabeth Bilo
Vrije Universiteit Amsterdam
Kyra Lubbers
Nadieh Drenth
Leiden University Medical Center
Nikki Nibbering
Leiden University
Funding information
Netherlands Organization for Scientific Research
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