A study found a difference between how boys and girls respond to prenatal exposure to the insecticide chlorpyrifos. At age seven, boys had greater difficulty with working memory (a key component of IQ) than girls with similar exposures. MRI scans show that even low to moderate levels of exposure during pregnancy may lead to long-term, potentially irreversible changes in the brain. The chemical is used in agriculture, wood treatments, golf courses, parks, and road medians. Low-level exposure can also occur by eating fruits and vegetables that have been sprayed with chlorpyrifos.
Neurotoxicology and Teratology, Aug 2012