Take a look at one of your hands, specifically focusing on your index finger (2D) and ring finger (4D). If you’re a man, your index finger is probably slightly shorter than your ring finger. If you’re a woman, they’re probably about the same length. How these two fingers compare might not mean much to you, but some scientists think the ratio between the lengths of these two fingers (2D:4D) can predict your health, personality, musical ability, and even your sexual orientation. Why? Because these researchers think that 2D:4D is a biomarker of exposure to higher levels of testosterone in the womb, and this, they say, can have lasting effects throughout one’s life. One of them even thinks that sports teams should use the ratio as a criterion for selecting players!
Dr. James Smoliga, a Professor of Physiology in the Department of Physical Therapy at High Point University, is not one of those scientists. Reviewing some of the more than 1,400 papers published over the past two decades linking 2D:4D to pretty much anything (reduced risk for video game addiction, sumo wrestling success, artistic ability, penis size, etc.), he grew skeptical that this one physical trait could reveal so much about our lives.Read More