| Genetic effects on infant handedness under spatial constraint conditions. | |
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MedLine Citation:
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PMID: 19728325 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Kunitake Suzuki; Juko Ando; Naho Satou |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Twin Study |
Journal Detail:
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Title: Developmental psychobiology Volume: 51 ISSN: 1098-2302 ISO Abbreviation: Dev Psychobiol Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-12-01 Completed Date: 2010-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0164074 Medline TA: Dev Psychobiol Country: United States |
Other Details:
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Languages: eng Pagination: 605-15 Citation Subset: IM |
Affiliation:
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Twin Behavioral Development, Research Center, Keio Advanced, Research Centers, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan. suzuki@totcop.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Chi-Square Distribution Child Development / physiology* Female Functional Laterality / genetics* Hand / physiology Humans Infant Infant Behavior / physiology Male Movement / physiology Orientation / physiology Spatial Behavior / physiology* Twins, Dizygotic / genetics Twins, Monozygotic / genetics Video Recording |
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