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Related Experiment Video

Updated: Jun 12, 2025

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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People with higher systemizing traits have wider right hands.

Na Chen1, Souta Hidaka2,3, Naomi Ishii1

  • 1Developmental Disorders Section, Department of Rehabilitation for Brain Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan.

Frontiers in Psychiatry
|September 20, 2024
PubMed
Summary

Individuals with autism spectrum disorder (ASD) may show subtle hand differences. This study found a link between right-hand aspect ratio and systemizing traits in the general population.

Keywords:
finger lengthhand configurationmetacarpophalangeal jointssystemizing quotientwidth-to-length ratio

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Area of Science:

  • Neurodevelopmental disorders
  • Human anatomy
  • Genetics

Background:

  • Autism spectrum disorder (ASD) is linked to genetic factors affecting neurodevelopment and potentially hand development.
  • Subtle anatomical variations, like hand configurations, may be present in individuals with ASD.
  • Research on finger ratios in ASD is limited, with potential links to prenatal hormone exposure.

Purpose of the Study:

  • To investigate the association between hand configurations and ASD-related traits in the general population.
  • To explore potential genetic or hormonal underpinnings of these associations.

Main Methods:

  • Photographs of dorsal hand surfaces were captured.
  • Measurements included metacarpophalangeal joint distances and finger lengths.
  • ASD-related traits were assessed using the Autism Spectrum Quotient, Empathy Quotient, and Systemizing Quotient.

Main Results:

  • A significant positive correlation was observed between the right hand's aspect ratio and Systemizing Quotient scores.
  • Individuals with a higher aspect ratio (wider hand relative to finger length) exhibited more systemizing traits.

Conclusions:

  • Hand configurations, specifically the right hand's aspect ratio, are associated with systemizing traits.
  • These findings suggest that genetic polymorphisms or prenatal sex hormone exposure may influence both systemizing abilities and hand morphology.