Second to fourth digit ratio and numerical competence in children

Area of Science:

• Developmental Psychology
• Behavioral Endocrinology
• Cognitive Neuroscience

Background:

• The 2nd to 4th digit ratio (2D:4D) is a proposed marker for prenatal androgen exposure.
• Males typically exhibit lower 2D:4D ratios, suggesting higher prenatal testosterone (T) exposure.
• Sex differences in cognitive abilities, including numerical competencies, are well-documented.

Purpose of the Study:

• To investigate the relationship between 2D:4D ratios and numerical competencies in children.
• To explore potential sex differences in the association between prenatal T exposure and numerical skills.

Main Methods:

• Studied 73 children aged 6-11 years.
• Assessed numerical competencies in counting, number knowledge, and visual-number representation.
• Correlated right and left hand 2D:4D ratios with performance in numerical tasks.

Main Results:

• Found significant negative correlations between numerical performance and 2D:4D ratios in boys for all tested domains.
• No significant correlations were observed between 2D:4D ratios and numerical performance in girls.
• Results suggest a potential link between higher prenatal T exposure and better basic numerical skills in boys.

Conclusions:

• Higher prenatal testosterone exposure may be associated with enhanced numerical abilities in boys.
• Prenatal T exposure might influence the development of numerical competencies differently in boys and girls.