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Is Handedness at Five Associated with Prenatal Factors?

Jacqueline Fagard1, Maria De Agostini2, Viviane Huet1

  • 1INCC UMR 8002, CNRS, Université de Paris, F-75006 Paris, France.

International Journal of Environmental Research and Public Health
|April 3, 2021
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Summary
This summary is machine-generated.

Paternal handedness and birth presentation influence child handedness. Factors like season of birth and sex also affect laterality, especially in premature girls, impacting hand preference development.

Keywords:
family handednesshandednessprenatal factors

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Area of Science:

  • Developmental Psychology
  • Human Genetics
  • Neuroscience

Background:

  • Handedness, a complex trait, is influenced by multiple genetic and environmental factors.
  • Understanding these influences is crucial for developmental and neurological research.

Purpose of the Study:

  • To investigate prenatal and perinatal factors associated with children's handedness.
  • To analyze the relationship between parental handedness, birth presentation, gestational age, season of birth, and sex on child handedness at five years.

Main Methods:

  • Analysis of data from the EDEN cohort, including 1897 children.
  • Handedness assessment at five years for 1129 children.
  • Statistical analysis of factors including parental handedness, birth presentation, gestational age, season of birth, and sex.

Main Results:

  • Paternal non-right-handedness significantly correlated with increased left-handedness in children.
  • Children born in non-left-cephalic presentations showed a trend towards left-handedness.
  • Premature girls (<37 weeks) exhibited reduced lateralization compared to those born later.
  • Children born in winter/spring were less lateralized than those born in summer/autumn.

Conclusions:

  • Paternal handedness and birth presentation are significant factors in child handedness.
  • Gestational age and season of birth also play a role in lateralization, particularly in girls.
  • These findings support a mixed model of handedness, integrating genetic and environmental influences.