Older children born to men with low IQ

Recently, one for the past 30 003 thousand children study conducted by the U.S. data concluded that children born to older fathers of cognitive capacity is low. However, the IQ difference between them is small, and there is no research on the development of these children had been investigated IQ.

 
"The older the father, his children's performance in intelligence tests the worse," Queensland University of Graz, said lead researcher John Mack.
Reason may be related with the aging of sperm.

 
Mike Graz, said: "We are concerned that older men's sperm cell formation in the process will accumulate more mutations, the gradual accumulation of these defects and thus increase the risk of child IQ problems, and these defects are likely to be passed on to the next generation."

 


 
A 2006 study found that older men gave birth to a greater chance of dwarf children, which by their age-related mutations caused. Michael Graz, said many other studies have indicated that children of older fathers and autism risk of schizophrenia and increases the probability of certain relationships. "The New York Times" has written that a 2005 study found that children of older fathers to sixteen-year-old language when not in use lower intelligence test scores, gave birth to the teenage children of men is also true.

 
Mike selected the database in Graz, the children in its 8-month-old, four years old, the age of seven for a variety of intelligence tests, such as the degree of concentration, memory, learning ability, understanding, and that reading ability. 50 years of age or older men the child that all of these indicators IQ scores below 20-year-old man gave birth to an average child's score.

 
However, most of this week, reports on the discovery did not mention or played down the point is little difference between the test scores. Any person can understand IQ testing can tell, they did not give any personal smart all the indicators or ability level of the range.

 
And we can not know whether these children scored lower in their adult stage may catch up (did a study in 2007 pointed out, low-grade achievement test scores are high or low IQ middle-aged good prediction). Mike Gratz and colleagues, the conclusion needs further study.

 
Is well known that older mothers and more children born with Down syndrome (Down's syndrome). But Mike Graz said that in intelligence tests, older women, even children had higher scores. His research team speculated that this may be because older women have more time with their children along.

The study group did not receive any outside funding, March 10 online issue of journal "PLoS Medicine" this study is described in detail. Mike Gratz said the study has some significance to society, because compared to the generations, many couples want to wait until the current bear children late in life.

 
These findings may make men and women thinking about child-rearing become clear later years. Because many scientists have long been considered that as the male reproductive capacity can be long maintained, old and father do nothing big deal. New York University Medical Center psychiatrist and researcher Dolores told the "Times" said: "The results show that the optimal age of motherhood is the best age of a father."