This project is the second measurement of a longitudinal study on the source of individual differences of cognition, attention, and executive functioning from preschool to young adulthood. This project included the measurement five years after baseline and additionally recruited new twin pairs and siblings of the twin pairs. Behavioral data were collected with surveys filled in by parents and teachers (Conners, Child Behavior Checklist (CBCL), Strengths and Weaknesses of ADHD symptoms and Normal behavior Scale (SWAN), Teacher Report Form (TRF)) or filled in by children themselves (Youth Self Report (YSR)). To measure pubertal development, children filled in the Tanner questionnaire. Neurocognitive abilities were assessed with computerized ANT tasks, Flanker, Simon and Stroop. IQ was assessed with WISC-R. DNA was collected to determine zygosity and for genotyping SNP’S at candidate gene loci. Saliva was collected to assess cortisol concentrations.

Subject age
  • 12.0 years
Time span From 2002-01-01 to 2004-01-01
Geographic location NL
Dorret I. Boomsma
Vrije Universiteit Amsterdam
Tinca Polderman
Vrije Universiteit Amsterdam
Funding information
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