testosterone

Some research suggests that the ratio of the length of the index finger to the ring finger (especially if the ring finger is longer than the index finger) reflects the influence of testosterone in the fetus. This ratio is called the "2D:4D ratio" and suggests the following associations: 1. Indicator of testosterone - It is believed that if the ring finger is longer than the index finger, the fetal testosterone level may have been higher. - It is believed that a longer ring finger indicates more testosterone and may have more masculine characteristics to begin with. 2. Biological influence - The 2D:4D ratio has been linked to various biological factors, including gender characteristics and behavior, as well as effects on pregnancy and childbirth. For example, it has been suggested that it may affect sports ability, leadership, and personality traits.