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Related Experiment Videos

Hormones and handedness.

J Mulligan1, R J Stratford, B J Bailey

  • 1The Wessex Growth Study, University Child Health, Southampton General Hospital, Southampton, UK. jm1@soton.ac.uk

Hormone Research
|January 30, 2002
PubMed
Summary

Left-handedness is more common in short normal (SN) children but not linked to birth complications. Laterality may influence cognitive ability and pubertal timing in SN individuals.

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Area of Science:

  • Pediatric endocrinology
  • Developmental psychology
  • Human genetics

Background:

  • The Wessex Growth Study has tracked growth and psychological development in short normal (SN) and average height children since 1985/1986.
  • A higher prevalence of left-handedness (25% vs. 9%) was observed in SN children, who also showed lower IQ, attainment, and internalisation of control.
  • Left-handedness is associated with intrauterine environment influences and pubertal delay; SN children at recruitment had low birth weight and delayed bone age.

Purpose of the Study:

  • To investigate the association between birth conditions and lateral preference in SN children.
  • To determine if handedness explains psychometric assessment differences or predicts pubertal timing in SN children.

Main Methods:

  • Subjects were categorized as right-handed (RH) or left-handed (LH) based on writing hand.
  • Data analysis examined the effects of handedness and stature on growth and development.

Main Results:

  • No increased birth complications were found in RH or LH SN children compared to average height controls.
  • Psychometric testing revealed no significant differences between RH and LH SN children in growth patterns.
  • Both RH and LH SN children exhibited lower cognitive ability scores, with gender/handedness effects noted for pubertal timing and final height.

Conclusions:

  • Increased left-handedness in SN children is not linked to adverse birth conditions.
  • Hormones influencing growth and development may also impact brain laterality and cognitive development in SN children.

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