Do you have siblings? Have you ever thought that you're cleverer than your brother, but he is funnier and more outgoing than you? Well, maybe you're right at some point. Apparently, one study
says older siblings may be more intelligent than the younger ones. However, genes are not to blame.
Researchers at Leipzig University found that each successive sibling has a lower IQ than the last. The assumptions are based from three national studies, involving more than 20,000 people.
Experts believe that upbringing is the factor behind this, as well as the younger sibling's notion that they are less clever than the older child. Researchers said that the parents tend to give much fuller attention in the upbringing of their first kids than in their following offsprings.
"While the firstborn gets full parental attention, at least for some months or years, late-borns will have to share from the beginning," Researcher Julie Rohrer, who co-authored the research told the Telegraph
Though older kids may be cleverer than the younger ones, the IQ difference is relatively small. In fact, there is only 1.5 IQ points difference for each younger sibling.
Additionally, younger kids are given more freedom to do what they want, compared to older children who are usually pressured by their parents. Researchers also said that older kids tend to pass on knowledge to their younger siblings, which plays a part in increasing their IQ.
Rohrer explains, "Another possible factor is described by the tutoring hypothesis: A firstborn can “tutor” their younger siblings, explaining to them how the world works and so on."
"Teaching other people has high cognitive demands – the children need to recall their own knowledge, structure it and think of a good way to explain it to younger siblings, which could provide a boost to intelligence for some firstborns."
Researchers also debunk the common notion that younger siblings are funnier or more extroverted. They said, the truth is there were no differences in sibling personalities.
"One theory is that following children “dilute” the resources of their parents," said Rohrer.