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Kovas, Y.; Petrill, S. A.; Plomin, R. – Journal of Educational Psychology, 2007
The authors assessed 2,502 ten-year-old children, members of 1,251 pairs of twins, on a Web-based battery of problems from 5 diverse aspects of mathematics assessed as part of the U.K. national curriculum. This 1st genetic study into the etiology of variation in different domains of mathematics showed that the heritability estimates were moderate…
Descriptors: Etiology, National Curriculum, Genetics, Twins
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Groot, Alexia S.; De Sonneville, Leo M. J.; Stins, John F.; Boomsma, Dorret I. – Journal of Child Psychology and Psychiatry, 2004
Background: In this study several aspects of attention were studied in 237 nearly 6-year-old twin pairs. Specifically, the ability to sustain attention and inhibition were investigated using a computerized test battery (Amsterdam Neuropsychological Tasks). Furthermore, the Teacher's Report Form (TRF) was filled out by the teacher of the child and…
Descriptors: Twins, Reaction Time, Attention Deficit Disorders, Inhibition