Thursday, July 06, 2006

 

twins and cognition

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Performing your original search, twins cognition genetics, in PubMed will retrieve 189 citations.

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1: Science. 1997 Jun 6;276(5318):1560-3. Related Articles, Links
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Substantial genetic influence on cognitive abilities in twins 80 or more years old.

McClearn GE, Johansson B, Berg S, Pedersen NL, Ahern F, Petrill SA, Plomin R.

Center for Developmental and Health Genetics, The Pennsylvania State University, University Park, PA 16802, USA.

General and specific cognitive abilities were studied in intact Swedish same-sex twin pairs 80 or more years old for whom neither twin had major cognitive, sensory, or motor impairment. Resemblance for 110 identical twin pairs significantly exceeded resemblance for 130 fraternal same-sex twin pairs for all abilities. Maximum-likelihood model-fitting estimates of heritability were 62 percent for general cognitive ability, 55 percent for verbal ability, 32 percent for spatial ability, 62 percent for speed of processing, and 52 percent for memory. There was also evidence for the significant influence of idiosyncratic experience as the environmental component that most determines individual differences in cognitive abilities late in life.

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PMID: 9171059 [PubMed - indexed for MEDLINE]
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Jun 28 2006 06:42:17


# posted by roodbont @ 12:36 AM
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