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There are many research methods available to psychologists in their efforts to understand, describe, and explain behavior and the cognitive and biological processes that underlie it.
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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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The Quebec Newborn Twin Study at 21.

Michel Boivin1, Mara Brendgen2, Ginette Dionne1

  • 1School of Psychology, Université Laval, Québec, Canada.

Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies
|October 22, 2019
PubMed
Summary

The Quebec Newborn Twin Study (QNTS) tracks twins' development from infancy to adulthood. It examines how early genetics and environment influence cognitive, behavioral, and social-emotional outcomes over 24 years.

Keywords:
gene–environment transactionsinfancylanguagelongitudinal twin studynumeracypeer relationshipspreschoolschool readiness and achievementsocial-emotional development

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Area of Science:

  • Developmental Psychology
  • Behavioral Genetics
  • Epidemiology

Background:

  • The Quebec Newborn Twin Study (QNTS) is a prospective longitudinal follow-up of twins born in Montreal between 1995-1998.
  • It is an updated description of an ongoing study documenting developmental health across childhood.

Purpose of the Study:

  • To document individual differences in cognitive, behavioral, and social-emotional development.
  • To identify early genetic and environmental determinants of developmental trajectories.
  • To investigate the role of early development in later life outcomes (social-emotional adjustment, school, health, occupation).

Main Methods:

  • Prospective longitudinal follow-up of a birth cohort of twins.
  • Multi-informant and multimethod assessments of physiological, cognitive, behavioral, school, and health phenotypes.
  • Detailed multilevel assessments of proximal (parenting, peer relations) and distal (family income) environmental factors.
  • Genotyping of twins and parents for polygenic score computation.

Main Results:

  • 16 waves of data collected or planned over 24 years, including 5 preschool waves.
  • Comprehensive longitudinal data on a broad range of developmental phenotypes.
  • Rich environmental data, including genetic information, enabling gene-environment transaction studies.

Conclusions:

  • The QNTS provides a unique dataset for studying early development and gene-environment interactions.
  • Longitudinal data across multiple domains are crucial for understanding developmental trajectories.
  • The study is well-positioned to examine the long-term impact of early life experiences and genetic factors.