Firstborn children score significantly higher in IQ tests than their younger siblings, according to a large study of 250,000 military draftees in Norway.The researchers say the difference is due to social, not biological, factors, as younger siblings have higher IQs if they are raised as an eldest child following the death of an older brother or sister. The findings could suggest better ways of parenting the youngest children in a family.
The analysis revealed that firstborn men have, on average, an IQ that is about 2.3 points higher than those who are second-born. The trend continues such that second born men have higher IQs than their third-born brothers, and so on.The new research shows that it is social birth order – and not actual birth order – that really matters: a person whose older sibling died at a young age generally has a 2.3 point higher IQ score than other second-born individuals.
The analysis revealed that firstborn men have, on average, an IQ that is about 2.3 points higher than those who are second-born. The trend continues such that second born men have higher IQs than their third-born brothers, and so on.The new research shows that it is social birth order – and not actual birth order – that really matters: a person whose older sibling died at a young age generally has a 2.3 point higher IQ score than other second-born individuals.
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