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Hand preference in a normal population.

S J Ellis1, P J Ellis, E Marshall

  • 1Department of Medicine, Frimley Park Hospital, Camberley, Surrey.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 1, 1988
PubMed
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Handedness assessment using the Edinburgh Inventory reveals significant age-related shifts in right-handedness and left-handedness. While not statistically significant, a slight increase in left-handedness was noted in twins and males.

Area of Science:

  • Neuroscience
  • Human Genetics
  • Developmental Psychology

Background:

  • Handedness, the preference for using one hand over the other, is a complex trait.
  • Factors influencing handedness include genetics, developmental processes, and potentially environmental influences.
  • Understanding population-level variations in handedness is crucial for developmental and neurological research.

Purpose of the Study:

  • To investigate the incidence of handedness in a normal population using the Edinburgh Inventory.
  • To examine the influence of age, twin status, and sex on handedness prevalence.
  • To explore the theoretical implications of observed handedness patterns.

Main Methods:

  • Utilized the Edinburgh Inventory for handedness assessment.

Related Experiment Videos

  • Analyzed data from a normal population sample.
  • Performed statistical analysis to evaluate age, twin, and sex effects on handedness incidence.

    • Main Results:

    • A significant increase in strong right-handedness with advancing age was observed.
    • A significant decrease in left-handedness incidence was found as age increased.
    • A non-significant trend towards increased left-handedness in twins and males compared to females was noted.

    Conclusions:

    • Age significantly impacts the prevalence of both right-handedness and left-handedness in the studied population.
    • While minor differences exist, the incidence of left-handedness between sexes is small (under 1.5%), suggesting significant theoretical implications.
    • Further research is warranted to explore the subtle influences on handedness, particularly in twins and across sexes.