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2nd to 4th digit ratios, fetal testosterone and estradiol.
- S. Lutchmaya, S. Baron-Cohen, P. Raggatt, R. Knickmeyer, J. Manning
- Biology, Medicine
- Early human development
- 1 April 2004
BACKGROUND The ratio of 2nd to 4th digit length (2D:4D) is sexually dimorphic (mean 2D:4D is lower in males than females) and is thought to be fixed early in development. 2D:4D has been reported to… Expand
Foetal testosterone and eye contact in 12-month-old human infants
Amniotic fluid was analysed for foetal testosterone (FT) level. Postnatally, the infants (29 girls and 41 boys) and parents were filmed at 12 months of age, and the amount of eye contact made by the… Expand
Foetal testosterone and vocabulary size in 18- and 24-month-old infants
Amniotic fluid, obtained from 87 pregnant women for routine amniocentesis, was analysed for foetal testosterone (FT) level. Their infants (40 girls and 47 boys) were followed up 18 and 24 months… Expand
Human sex differences in social and non-social looking preferences, at 12 months of age
Abstract Twelve-month-old infants (n=60) were presented with a video of cars moving, or a face moving, in a looking preference experimental design. This tested the prediction from our earlier work… Expand
Prenatal Testosterone in Mind: Amniotic Fluid Studies
This pioneering study looks at the effects of prenatal testosterone on postnatal development and behavior. Hormonal effects on behavior have long been studied in animals; the unique contribution of… Expand