However, it should be noted that this effect size estimate for D may be attenuated this is due to it having been derived from self-measured finger lengths, which are known to be associated with high levels of random measurement error 8. Small-to-medium sized sex differences (male < female) are reliably observed for R2D:4D ( d = 0.457) and L2D:4D ( d = 0.376) 9, but that for D appears to be much smaller ( d = 0.065) 8. Low R2D:4D relative to L2D:4D has been suggested to reflect high prenatal androgen exposure 6, 7, 8. Researchers typically measure digit ratios for the right hand (R2D:4D) and/or left hand (L2D:4D), though sometimes also examine directional asymmetry (D ). More specifically, it has been suggested that a high concentration of testosterone 1, 2 or high ratio of testosterone-to-estradiol (T:E) 3, 4, 5 during prenatal development results in low 2D:4D.
The ratio of second (index) to fourth (ring) finger length (digit ratio or 2D:4D) has been hypothesised to reflect individual differences in prenatal exposure to sex hormones. Taken together, the results of our study suggest research with larger samples is required to determine whether digit ratios are valid proxies for maternal sex hormone exposure. However, the first of these effects is in the opposite direction to that predicted by theory. Nevertheless, the multivariate level of analysis did reveal that T correlated positively with left hand digit ratio (L2D:4D) and negatively with D. Although the testosterone (T) to estradiol (E) ratio correlated negatively with right hand digit ratio (R2D:4D) and directional asymmetry (right-minus-left) in digit ratio (D ), neither effect remained statistically significant once demographic and obstetric covariates were controlled for. We report the first pre-registered study to investigate mothers’ early pregnancy sex hormone concentrations in relation to their children’s digit ratios measured at 18–22-month follow-up. They're in SF, which still has an easy-to-find gay population.The ratio of index to ring finger (2D:4D) has been hypothesised to indicate prenatal androgen exposure, yet evidence for its validity is lacking. I wonder if the Mythbusters could handle this. It lends itself to the really fun sort of test you can do in a bar and, without realizing it, change the outcome because of what you already know about the person and subtle changes in how you hold their hand. What I'm saying is this: it's an unreliable measurement technique unless you have standardized tools and lab equipment. That is, until I let my shoulder relax, the angles changed, and I suddenly realized Angenlina Jolie has many attractive characteristics. Then I cocked my wrist and suddenly wanted. Then I pulled my fingers more tightly together, and I was straight again. I, falling firmly toward the hetero male end of the spectrum, slapped my hand on the counter and was forced to realize that I am gay. But too lazy to research the rebuttal and edit the page.Ģd:4d length sounds like bunk to me, mostly because it is so easy to measure (it can be done by anyone) and so easy to mismeasure. * determine the sex of drawers of Palaeolithic hand stencils found in European and Indonesian cavesĢd:4d effects has also supposedly been demonstrated in gorillas, chimpanzees, mice, rats, and zebra finches. * handedness, autism, other immune diseases * Fraternal birth order effect on digit ratio. * Difference in digit ratio between identical female twins discordant for sexual orientation Some studies correlate male homosexuality and 2D:4D positively, others negatively. * Gay vs straight men, but most studies find no differences in digit ratio between gay and straight men. * Bem sex role score in women erotic role preferences in gay men. * Exam scores: a higher ratio is correlated with higher exam scores among male students * Perceived 'dominance' and masculinity of man's face * Risk for eating disorders in females and males A single ratio of finger length, can apparently determine all of the following in humans: * Sperm counts The Wikipedia entry is crazy stupid on this topic. I have to admit this is a new one on me, but it's obvious to me that it's complete BS.
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