Wave 2 of the Early Childhood Cohort consisted of an online questionnaire and a lab visit in which participants were observed while performing several tasks. During some of the tasks, brain activity was measured by means of EEG. Additionally, physiological samples were taken (e.g., hair and DNA samples). Participants were also asked to take measurements on their own at home for several days after the lab 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
  • 4.0 - 5.0 years
Time span From 2015-08-27 to 2016-10-21
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
Bianca Langhout-van den Bulk
Erasmus University Rotterdam
Brigitte van den Berghe
Charlotte de Vries
Debby van Hees
Ilse de Visser
Ilse van Wijk
Laura Kolijn
Vrije Universiteit Amsterdam
Lianne van Setten
Vrije Universiteit Amsterdam
Rachel Vermeulen
Rani Damsteegt
Sanne de Vet
Leiden University
Saskia Euser
Sjoerd Dobbinga
Funding information
Netherlands Organization for Scientific Research
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