The 2nd:4th digit ratio and asymmetry of hand performance in Jamaican children J.T. Manning University of Liverpool, UK R.L. Trivers Rutgers University, USA R. Thornhill University of New Mexico, USA D. Singh University of Texas, USA Testosterone, particularly prenatal testosterone, has been implicated in the aetiology of many extragenital sexually dimorphic traits. It is difficult to test directly for the effect of prenatal testosterone in humans. However, Manning, Scutt, Wilson, and Lewis-Jones (1998b) have recently shown that the ratio of the length of the 2nd and 4th digits (2D:4D) in right hands negatively predicts testosterone levels in men. As digit ratios are fixed in utero it may be that the 2D:4D ratio is associated with many prenatally determined sexually dimorphic traits. We tested this for one case by examining the relationship between lateralised hand performance (LHP), as measured by an Annett peg board, and 2D:4D ratio in rural Jamaican children. 2D:4D ratio was measured from photocopies and X rays of hands. A low 2D:4D ratio in the right hand of boys and girls (photocopies) and the right hand of boys only (X rays) was associated with a reduction in rightward performance asymmetry. In both samples the difference in 2D:4D ratio between the hands (2D:4D left hand–2D:4D right hand) showed the strongest relationship with LHP i.e. high ratio in the left and low in the right correlated with a tendency towards a fast performance with the left hand. It is suggested that the 2D:4D ratio may be associated with the expression of other sexually dimorphic behavioural traits. LATERALITY, 2000, 5 (2), 121–132 Address correspondence to J.T. Manning, School of Biological Sciences, PO Box 147, Liverpool L69 3BX, UK. For permission to work, we thank the Jamaican Ministry of Education and Culture. For their help, we thank the principals and teachers, and we thank especially Mr Vernon Cameron. For help with the measurements, we are especially grateful to Mirit Cohen and Allison Sievwright. For their participation we thank the children and parents of the Top Hill area. For support we are grateful to Rutgers University, The Ann and Gordon Getty Foundation, and the Biosocial Research Foundation. Ó 2000 Psychology Press Ltd http://www.tandf.co.uk /journals/pp/1357650X.html