Psikhologicheskie Issledovaniya • ISSN 2075-7999
peer-reviewed • open access journal


Chertkova Yu.D. Sibship size and cognitive development of twins

Full text in Russian: Черткова Ю.Д. Влияние фактора наличия сиблингов на когнитивное развитие близнецов
Lomonosov Moscow State University, Moscow, Russia

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The influence of family structure (sibship size and birth order) on academic achievement in twins was analyzed. This study is a part of comparative research of academic achievement in school-age twins and singletons, which was supported by grant from the Russian Humanitarian Scientific Fund. Results show that family size (number of siblings) has negative correlation on cognitive development of twins; in families with higher SES sibship size less influence on scholastic achievement; birth order don’t influence on academic achievement of twins in families with 3 children.

Keywords: academic achievement, twins, family structure, siblings, socio-economic status, birth order, schoolchild


The study was supported by the Russian Foundation for Humanities, project 06-06-00227а, project 04-06-00240.


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Available online 18 february 2009.

About author

Chertkova Yulia D. Ph.D., Department of Behavioral Genetics, Faculty of Psychology, Lomonosov Moscow State University, Mokhovaya, 11/5, 125009 Moscow, Russia.
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APA Style
Chertkova, Yu. D. (2009). Sibship size and cognitive development of twins. Psikhologicheskie Issledovaniya, 1(3). Retrieved from [in Russian, abstr. in English].

Russian State Standard GOST P 7.0.5-2008
Chertkova Yu.D. Sibship size and cognitive development of twins [Electronic resource] // Psikhologicheskie Issledovaniya. 2009. N 1(3). URL: (date of access: [in Russian, abstr. in English]

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