The researchers assessed the level of children's intelligence and compared the information with the succession in the family the child was born. It appeared that first-borns were significantly more likely to boast higher IQ scores. About it reports the Internet-the portal PNAS.
The difference in intelligence, though noticeable, but does not affect the future life of children, say scientists. It has no connection with biological and genetic factors. While the explanation of the phenomenon simply does not exist. There is only speculation.
According to one of them, older children spend more time studying, helping younger students. Maybe this is the answer to the success of the firstborn. Proven fact: many younger children in the family initially believe themselves to be dumber than senior, such a position is sometimes shared by a parent not paying the child's education neglected.