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Related Experiment Videos

The disadvantages of dextrality for intelligence.

M Annett1, M Manning

  • 1Department of Psychology, University of Leicester, UK.

British Journal of Psychology (London, England : 1953)
|May 1, 1989
PubMed
Summary

The right shift theory suggests handedness has costs and benefits. Strongly right-handed children showed lower academic ability, indicating potential disadvantages of extreme dextrality.

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Area of Science:

  • Neuroscience
  • Human Development
  • Cognitive Psychology

Background:

  • The right shift (RS) theory posits that human bias towards right-handedness (dextrality) involves both advantages and disadvantages.
  • Understanding the relationship between handedness and cognitive abilities is crucial for theories of brain lateralization and development.

Purpose of the Study:

  • To investigate the relationship between the extent of right shift in handedness and cognitive abilities in children.
  • To test the hypothesis that the costs of right shift are associated with reduced skill in the non-dominant left hand.

Main Methods:

  • Assessed hand preference and hand skill in children from six primary schools.
  • Utilized Raven's Matrices and standardized educational test scores to measure cognitive ability.
  • Stratified children by ability and analyzed hand preference and right-minus-left (R-L) hand skill distributions.

Main Results:

  • Children with stronger right-hand preference and skill (higher R-L scores) exhibited lower performance on cognitive tests, including Raven's Matrices and English.
  • A consistent trend showed declining ability across the laterality continuum from left to right.
  • Strong dextrality correlated with weaker left-hand skill, supporting the hypothesis that right shift costs affect the right hemisphere.

Conclusions:

  • Strong right-handedness in children is associated with diminished cognitive abilities, suggesting potential costs to extreme dextrality.
  • Findings support the right shift theory's implications for hemisphere specialization and developmental pathology theories.
  • The study highlights a complex interplay between handedness, skill, and cognitive performance.

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