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Who is the most intelligent among the siblings? The study, published the journal Science analyze the IQ (Intelligence Quotient) of nearly 250,000 Norwegians aged 18 to 19 years. As a result, an older sibling had higher IQ scores than younger siblings.
In addition to numerous other advantages such as had hours of sleep a night and no one dared to order us around, the first child turned out to have a higher IQ than his brothers.
Previous research conducted by the same researchers analyzed data on more than 100,000 people of Norway and found that the first child had an IQ 2.3 points higher than his brothers were younger.
IQ of all the children were taken when she was 18 or 19 years, that can be compared between scores brother and sister at the same age.
"These are two studies of birth order and intelligence is most important during the last 75 years," said psychologist Frank Sulloway of the University of California, Berkeley, as quoted by LiveScience,
Researchers also compared between children who lost their older brothers then treated as firstborn children who actually born first. The researchers found that both groups are the same IQ.
"The second boy who lost his brother and became the first child to have the same IQ with the first child," said Sulloway.
Sulloway second study is to respond to criticism from the first study to state that these findings could have been influenced by other factors such as family size and parental IQ.
Sulloway has a theory to explain the results of the current research. He proposed that the older brother became a teacher for younger siblings so strengthen their own learning. However, direct evidence for this theory is lacking.
In fact, the younger brother started life with a higher IQ. Younger children have not mastered the skills like those of his brother, the younger children do not bother to learn it themselves and will be taught by his sister. It can be said that the younger children had lower learning environments older brother.
"Whenever there are more children were born, it lowers the intellectual environment everyone in the family," said Sulloway.
But at the age of about 12 years, the trend turns and overtaking first child younger siblings. Sulloway indicates that although the older brother of his IQ is higher because of the time devoted to study spent elsewhere besides joint younger siblings. This led to his brother may excel in other fields such as the arts or sports.
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