From: rhinoceros (rhinoceros@freemail.gr)
Date: Wed May 26 2004 - 09:07:01 MDT
I am forwarding this snip from another mailing list. Any comments?
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There is ANOTHER hypothesis for the time course of Black-White differences in standardized test scores leading to a quite noticeable change by 1990. It is well known that uptake of lead lowers IQ scores and school performance (as I've confirmed with town data on MCAS standardized tests in multiple subjects and grades). Equally evidence, Blacks -- due to lactose intolerance as well as diets poor in calcium and old housing with lead paint -- tend to have higher lead levels than whites in the same environment.
What is NOT generally known is that lead has especially harmful prenatal effects, and that lead can be a factor in loss of impulse control and violent crime. My published data show that sales of leaded gas are highly correlated with the decline in U.S. county level rates of violent crime that peaked in 1991. But BEWARE: sales in the same year as the crime is recorded are not correlated. In contrast, if violent crime is lagged 18 years or 19 years, the correlation is about 0.97. Prenatal exposure to lead is therefore a plausible hypothesis for changes in Black performance.
roger d masters
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