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Comments on Lindesay: laterality shift in homosexual men.

M Annett1

  • 1Department of Applied Social Studies, Coventry Lanchester Polytechnic, U.K.

Neuropsychologia
|January 1, 1988
PubMed
Summary

Homosexual men and dyslexic individuals show higher rates of non-right-handedness. This atypical laterality suggests a "reduction of right shift," aligning with handedness theories.

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Area of Science:

  • Neuroscience
  • Human Genetics
  • Psychology

Background:

  • Handedness, typically right-handedness, is influenced by genetic and developmental factors.
  • Atypical handedness, including left-handedness and mixed-handedness, is observed in certain neurodevelopmental and population groups.
  • The right shift theory proposes a biological basis for the prevalence of right-handedness.

Purpose of the Study:

  • To investigate the relationship between sexual orientation and handedness.
  • To examine the prevalence of non-right-handedness in homosexual men.
  • To evaluate if observed patterns of atypical laterality align with existing theories of handedness.

Main Methods:

  • Statistical analysis of handedness incidence in homosexual men compared to heterosexual populations.
  • Application of the normal distribution function to analyze handedness patterns.
  • Comparison of findings with data from dyslexic populations.

Main Results:

  • Homosexual men exhibit a higher incidence of strong left-handedness and mixed-handedness.
  • These findings are consistent with the normal distribution function.
  • The observed atypical laterality in homosexual men and dyslexics supports the right shift theory of handedness.

Conclusions:

  • Atypical laterality in homosexual men is characterized by a 'reduction of right shift' rather than a 'left shift'.
  • This finding provides further evidence for the right shift theory of handedness.
  • Understanding atypical laterality contributes to broader knowledge of neurodevelopmental variations.

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