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Researchers at the University of Wisconsin, Harvard Medical School/Children's Hospital Boston and the University of Minnesota found children adopted early from foster care didn't differ from children raised in their birth families. However, children adopted from institutional care performed at developmentally appropriate levels on tests involving sequencing and planning, but worse than those raised in families, on tests measuring visual memory and attention, learning visual information and impulse control.

The researchers said the study, published in Child Development, suggested children make tremendous advances cognitively once in their adoptive families, but the impact of early deprivation on their brains' development is difficult to reverse completely.

Study leader Seth Pollak of the University of Wisconsin and colleagues looked at 132 8-to-9 year-olds adopted by U.S. families for more than six years -- some of whom had been adopted after spending a year or more and in institutions in Asia, Latin America, Eastern Europe and Africa.

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