TY - JOUR
T1 - It Runs in the Family
T2 - Testing for Longitudinal Family Flynn Effects
AU - Wänström, Linda
AU - O’Keefe, Patrick
AU - Clouston, Sean A.P.
AU - Mann, Frank D.
AU - Muniz-Terrera, Graciela
AU - Voll, Stacey
AU - Zhang, Yun
AU - Hofer, Scott M.
AU - Rodgers, Joseph L.
N1 - Publisher Copyright:
© 2023 by the authors.
PY - 2023/3
Y1 - 2023/3
N2 - The Flynn effect refers to increases over time in measured (particularly fluid) intelligence of approximately 3 IQ points per decade. We define the Flynn effect at the family level, using longitudinal data and two new family-level cohort definitions. Multilevel growth curve analyses of the National Longitudinal Survey of Youth 1979 data showed that children in families with later-born mothers had higher average PIAT math scores, and lower average reading comprehension scores and growth, in young and middle childhood. Children in families where the first child was born later had higher average PIAT math, reading recognition, and reading comprehension scores, as well as larger developmental growth. The latter family-level Flynn effects were of higher magnitudes than the usual individual-level Flynn effect found in previous studies. Our results, showing family level-intercept and slope Flynn effects for both maternal birthyear and first child birthyear, have implications for research aiming to explain the Flynn effect.
AB - The Flynn effect refers to increases over time in measured (particularly fluid) intelligence of approximately 3 IQ points per decade. We define the Flynn effect at the family level, using longitudinal data and two new family-level cohort definitions. Multilevel growth curve analyses of the National Longitudinal Survey of Youth 1979 data showed that children in families with later-born mothers had higher average PIAT math scores, and lower average reading comprehension scores and growth, in young and middle childhood. Children in families where the first child was born later had higher average PIAT math, reading recognition, and reading comprehension scores, as well as larger developmental growth. The latter family-level Flynn effects were of higher magnitudes than the usual individual-level Flynn effect found in previous studies. Our results, showing family level-intercept and slope Flynn effects for both maternal birthyear and first child birthyear, have implications for research aiming to explain the Flynn effect.
KW - IQ
KW - NLSY
KW - family Flynn effect
KW - intelligence
KW - multilevel growth curve models
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U2 - 10.3390/jintelligence11030050
DO - 10.3390/jintelligence11030050
M3 - Article
AN - SCOPUS:85151085590
SN - 2079-3200
VL - 11
JO - Journal of Intelligence
JF - Journal of Intelligence
IS - 3
M1 - 50
ER -