Document Detail

Genetic effects on infant handedness under spatial constraint conditions.
MedLine Citation:
PMID:  19728325     Owner:  NLM     Status:  MEDLINE    
Previous studies have reported a genetic influence on the individual differences in adult handedness; however, relatively little is known about genetic influences on the development of infant hand selection. In the current study, we examined whether genetic influences on handedness are expressed in various spatial locations in infants aged 18 months using the twin method. Infants were asked to respond to targets positioned in left, middle, and right locations using grasping movements. Results showed that similarities in hand selection within monozygotic twin pairs was more than two times higher than that of the dizygotic twin pairs in the middle location. In the left location, similarities in hand selection within monozygotic and dizygotic twin pairs were low. In addition, low individual differences in hand selection in the right location were also observed. These results suggest a non-additive genetic influence on handedness, and that spatial constraint is a crucial factor for the expression of genetic effects on handedness in infants.
Kunitake Suzuki; Juko Ando; Naho Satou
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Twin Study    
Journal Detail:
Title:  Developmental psychobiology     Volume:  51     ISSN:  1098-2302     ISO Abbreviation:  Dev Psychobiol     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-01     Completed Date:  2010-02-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  605-15     Citation Subset:  IM    
Twin Behavioral Development, Research Center, Keio Advanced, Research Centers, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan.
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MeSH Terms
Chi-Square Distribution
Child Development / physiology*
Functional Laterality / genetics*
Hand / physiology
Infant Behavior / physiology
Movement / physiology
Orientation / physiology
Spatial Behavior / physiology*
Twins, Dizygotic / genetics
Twins, Monozygotic / genetics
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