Аннотация:The aim of the present study was to evaluate the association between digit ratio indices (representing the prenatal androgen and estrogen exposure) and different laterality indices, handedness (HDD), dominant eye (DE), hand clasping (HCL) and arm folding (ARMF) in a large (N=1586) Chuvashian population-based sample.
HDD showed a significant association with right phalangeal length ratio, right and left metacarpal ratio and right ray ratio. Subjects with a right dominant hand had lower right phalangeal, right and left metacarpal and right ray ratios than those with a left dominant hand. This is the first study showing a significant association between eye dominance and left metacarpal and left ray ratios. Subjects with a right DE had lower left metacarpal and left ray ratios than those with left DE. HCL and ARMF showed no association with radiologically measured digit ratios.
Keywords: 2D:4D; digit ratio; laterality, handedness, dominant eye, hand clasping, arm folding, Chuvashian population