Tuesday, June 15, 2010
Amusing crap about IQ
A murder in your area lowers your IQ -- even if you don't know about the murder concerned? It's totally implausible but Leftists never give up in their hatred of around 100 years of IQ research that show IQ to be mostly genetic.
The author below found that people living in areas where a crime had occurred recently have lower IQs. But what sort of area is likely to have experienced a crime recently? A area that has high rates of crime generally and an area where anybody with brains would NOT live. Note that criminals have long been known to have generally low IQs and very low levels of educational attainment.
So all that the author below in fact found was that people living in high crime areas tend to be dumb, which is no surprise to anyone. The journal article is The acute effect of local homicides on children's cognitive performance.
The statement below to the effect that "The effects wear off after a week to nine days" is simply not supportable from the data available. It is just another perverse guess. You would need before-and-after data on the same person to substantiate that claim and the author simply did not have such data.
A murder in the neighborhood can significantly knock down a child's score on an IQ test, even if the child did not directly witness the killing or know the victim, U.S. researchers reported on Monday....
Sharkey compared data on crimes broken down to within a few blocks in a neighborhood with school test scores.
He collected details of more than 6,000 murders in the Chicago area and the results of two surveys of children and families in Chicago neighborhoods. The surveys included scores from tests that are used to determine a child's IQ.
If a murder occurred in a child's neighborhood -- an area of roughly six to 10 square blocks as denoted by the U.S. Census -- the children's test scores fell by an average of half a standard deviation, Sharkey reported.
On an IQ test using 100 as the average or norm, one standard deviation is 15 points. So if a child took the test within a week of a local murder, his or her score was 7-8 points lower on average than the score of a similar child in a similar neighborhood where there was no murder.
This fits in with what is known about the effects of post traumatic stress, Sharkey said. "The results suggest that children may carry the burden of violence with them as they take part in daily life within the neighborhood or school settings," he said.
The effects wear off after a week to nine days, Sharkey found. But in areas with a lot of crime, this does not provide much relief.