In a recent study by the developmental psychologist Laurence Steinberg at Temple University, teenagers did a simulated high-risk driving task while they were lying in an fMRI brain-imaging machine.

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Measles, mumps, and rubella vaccination and bowel problems or developmental regression in children with autism: population study.

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Not just for productivity, but as we recently learned from a study in Zambia, there can be large developmental consequences of early childhood exposure to malaria.

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The study appears in the January 2011 issue of the journal Developmental Psychology.

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Caveat: The study excluded multiple births, which are associated with increased risk of developmental problems, limiting the findings to single gestations, researchers said.

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Those investigators found no link between chlorpyrifos and endpoints that were similar to those of 2006 study, but did identify an association between another chemical and pervasive developmental disorders (again, not diagnosed autism).

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Dr Wolf Reik, an expert in developmental genetics at the Babraham Institute in Cambridge, told the BBC News website the study was "interesting and intriguing".

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Among the eight studies, an original research study they reference is a 2006 report assessing links between a pesticide, chlorpyrifos , and developmental delays (not diagnosed autism) in urban-dwelling families.

FORBES: Are Pesticides A Key Driver Of The Autism Increase?