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Titolo:
GENETIC INFLUENCES ON CHILDHOOD IQ IN 5-YEAR-OLD AND 7-YEAR-OLD DUTCHTWINS
Autore:
BOOMSMA DI; VANBAAL GCM;
Indirizzi:
FREE UNIV AMSTERDAM,DEPT PSYCHOL,DE BOELELAAN 1111 NL-1081 HV AMSTERDAM NETHERLANDS
Titolo Testata:
Developmental neuropsychology
fascicolo: 1, volume: 14, anno: 1998,
pagine: 115 - 126
SICI:
8756-5641(1998)14:1<115:GIOCII>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
COGNITIVE-DEVELOPMENT; PROBLEM BEHAVIORS; CONTINUITY; ADOPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
D.I. Boomsma e G.C.M. Vanbaal, "GENETIC INFLUENCES ON CHILDHOOD IQ IN 5-YEAR-OLD AND 7-YEAR-OLD DUTCHTWINS", Developmental neuropsychology, 14(1), 1998, pp. 115-126

Abstract

To study changes in the genetic architecture of cognitive functioningas children grow up, we measured intelligence in a sample of young Dutch twins at ages 5 and 7 years. By applying a developmental model to the data, we could examine the continuity and change in genetic and environmental influences from age 5 to age 7. Results show that genetic influences persist from age 5 to age 7 and greatly gain in relative importance during this period. There is no evidence of new genetic influences being expressed at age 7. The influence of genetic factors on intelligence at age 5 is relatively small, accounting for 27% of the total phenotypic variance. At age 7, genetic factors explain 62% of the variance in IQ scores. This increase in heritability is due both to an increase in the total genetic variance and to a decrease in the amountof variance explained by shared environmental factors. The shared family background influences IQ in early childhood, and these effects also persist until age 7, but their relative importance becomes smaller. At age 5, the shared family environment accounts for half of the variance in IQ. At age 7, the influence of the family environment decreasesto 10%. Unique environment acts age specifically and accounts for roughly a quarter of the total variance in IQ both at ages 5 and 7.

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Documento generato il 23/01/20 alle ore 04:02:11