9.2 Developmental or age effects
Flynn, J. R. (1984a).IQ gains and the Binet decrements. Journal of Educational Measurement, 21, 283-290.
Lynn, R. (2009).What has caused the Flynn effect? Secular increases in the Development Quotients of infants. Intelligence,37(1),16-24
Sundet, J. M., Eriksen, W., Borren, I. & Tambs, K. (2010).  The Flynn effect in sibships: Investigating the role of age differences between siblings.  Intelligence, 38, 38–44.
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