Genetic effects on infant handedness under spatial constraint conditions

Kunitake Suzuki, Jyukou Andou, Naho Satou

Research output: Contribution to journalArticle

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)605-615
Number of pages11
JournalDevelopmental Psychobiology
Issue number8
Publication statusPublished - 2009



  • Genetics
  • Grasping movement
  • Handedness
  • Motor development
  • Spatial location
  • Toddler
  • Twin infant
  • Twin method

ASJC Scopus subject areas

  • Developmental Biology
  • Behavioral Neuroscience
  • Developmental Neuroscience
  • Developmental and Educational Psychology

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