Firstborns frequently score higher on IQ and achievement tests than their younger siblings, but a new report suggests that how siblings are raised, not their birth order, is what matters when it comes to brain power.
"This study provides evidence that the relation between birth order and IQ score is dependent on the social rank in the family not birth order as such," write investigators in Friday's edition of Science magazine.
Dr. Petter Kristensen of the National Institute of Occupational Health in Oslo, Norway, and a colleague studied the birth order, IQ, and vital status of elder siblings of more than a quarter million 18- and 19-year-old male Norwegian military draftees.
"This study provides evidence that the relation between birth order and IQ score is dependent on the social rank in the family not birth order as such," write investigators in Friday's edition of Science magazine.
Dr. Petter Kristensen of the National Institute of Occupational Health in Oslo, Norway, and a colleague studied the birth order, IQ, and vital status of elder siblings of more than a quarter million 18- and 19-year-old male Norwegian military draftees.
Read about this study on Reuters Health
Its an interesting study because it lends support to the new economic theory of cultural capital and it also seems to use data that I think Paul Devereux has worked with before.
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