Prenatal thumb sucking is related to postnatal handedness

@article{Hepper2005PrenatalTS,
  title={Prenatal thumb sucking is related to postnatal handedness},
  author={Peter G. Hepper and Deborah L. Wells and Catherine Lynch},
  journal={Neuropsychologia},
  year={2005},
  volume={43},
  pages={313-315}
}
This study followed-up 75 individuals who were observed sucking their thumb as fetuses and examined their handedness, assessed by a modified version of the Edinburgh Handedness Inventory, at 10-12 years of age. Of 60 right-handed fetuses, all were right-handed postnatally; 10 of 15 left-handed fetuses were left-handed and five right-handed. Male left thumb sucking fetuses were more likely to be right-handed children than females. The study indicates that the prenatal exhibition of lateralised… 
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