|Illustration of the three possible 2D:4D ratio outcomes. Source: Higher Perspective|
Have a look at your hands, and in particular, the length of your fingers. Compare the length of your index finger (the second digit), to that of your ring finger aka the 4th digit. If your 2d digit is shorter, you will have a 2D:4D ratio less than one. If your index finger is longer, you'll have a ratio greater than one. If your two digits are the same length, you will have a 2D:4D ratio of one (or very close to it).
But of what significance is this? It turns out that the amount of testosterone present in the womb influences the 2D:4D ratio. A growing body of research tracing back to the late 1800s indicates that the amount of testosterone present in the womb also helps determine one's personality. Wikipedia offers the following:
"It has been suggested by some scientists that the ratio of [the] two digits ... is affected by exposure to androgens e.g. testosterone while in the uterus, and that this 2D:4D ratio can be considered a crude measure for prenatal androgen exposure, with lower 2D:4D ratios pointing to higher prenatal androgen exposure."And
"A number of studies have shown a correlation between the 2D:4D ratio and various physical and behavioral traits."
By comparison, in the same cognition and personality topic area, high digit ratios are associated with:
- Personality traits correlated with digit ratio, higher being more feminized
- Paranormal and superstitious beliefs among men with a higher digit ratio
- Higher exam scores among male students
One version of the so-called Finger Length Personality Test currently making the rounds was published April 17, 2015 at Higher Perspective. Entitled, "Here’s What Your Finger Length Reveals About Your Personality," this version comes with an explanation of the results that seems to hold true for myself and everyone I have checked (so far).