It Runs in the Family: Testing for Longitudinal Family Flynn Effects
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...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Journal of Intelligence |
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| Online Access: | https://www.mdpi.com/2079-3200/11/3/50 |
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| author | Linda Wänström Patrick O’Keefe Sean A. P. Clouston Frank D. Mann Graciela Muniz-Terrera Stacey Voll Yun Zhang Scott M. Hofer Joseph L. Rodgers |
| author_facet | Linda Wänström Patrick O’Keefe Sean A. P. Clouston Frank D. Mann Graciela Muniz-Terrera Stacey Voll Yun Zhang Scott M. Hofer Joseph L. Rodgers |
| author_sort | Linda Wänström |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T06:21:16Z |
| format | Article |
| id | doaj.art-86506be702274822a49a0643a3b4bfd7 |
| institution | Directory Open Access Journal |
| issn | 2079-3200 |
| language | English |
| last_indexed | 2024-03-11T06:21:16Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Intelligence |
| spelling | doaj.art-86506be702274822a49a0643a3b4bfd72023-11-17T11:55:29ZengMDPI AGJournal of Intelligence2079-32002023-03-011135010.3390/jintelligence11030050It Runs in the Family: Testing for Longitudinal Family Flynn EffectsLinda Wänström0Patrick O’Keefe1Sean A. P. Clouston2Frank D. Mann3Graciela Muniz-Terrera4Stacey Voll5Yun Zhang6Scott M. Hofer7Joseph L. Rodgers8Department of Computer and Information Science, Linköping University, 581 83 Linköping, SwedenDepartment of Neurology, Oregon Health and Science University, Portland, OR 97239, USAProgram in Public Health and Department of Family, Population, and Preventive Medicine, Stony Brook University, Stony Brook, NY 11794, USAProgram in Public Health and Department of Family, Population, and Preventive Medicine, Stony Brook University, Stony Brook, NY 11794, USAOhio University Heritage College of Osteopathic Medicine (OUHCOM), Dublin, OH 43016, USAInstitute of Aging and Lifelong Health, University of Victoria, Victoria, BC V8N 1V8, CanadaProgram in Public Health and Department of Family, Population, and Preventive Medicine, Stony Brook University, Stony Brook, NY 11794, USADepartment of Neurology, Oregon Health and Science University, Portland, OR 97239, USADepartment of Psychology and Human Development, Vanderbilt University, Nashville, TN 37232, USAThe 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.https://www.mdpi.com/2079-3200/11/3/50family Flynn effectIQintelligenceNLSYmultilevel growth curve models |
| spellingShingle | Linda Wänström Patrick O’Keefe Sean A. P. Clouston Frank D. Mann Graciela Muniz-Terrera Stacey Voll Yun Zhang Scott M. Hofer Joseph L. Rodgers It Runs in the Family: Testing for Longitudinal Family Flynn Effects Journal of Intelligence family Flynn effect IQ intelligence NLSY multilevel growth curve models |
| title | It Runs in the Family: Testing for Longitudinal Family Flynn Effects |
| title_full | It Runs in the Family: Testing for Longitudinal Family Flynn Effects |
| title_fullStr | It Runs in the Family: Testing for Longitudinal Family Flynn Effects |
| title_full_unstemmed | It Runs in the Family: Testing for Longitudinal Family Flynn Effects |
| title_short | It Runs in the Family: Testing for Longitudinal Family Flynn Effects |
| title_sort | it runs in the family testing for longitudinal family flynn effects |
| topic | family Flynn effect IQ intelligence NLSY multilevel growth curve models |
| url | https://www.mdpi.com/2079-3200/11/3/50 |
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