Although participants gave digit ratios from both their right and left hands, the differences were not significant and I averaged them together to create a less noisy measure. Of these, 454 were biologically male and 75 biologically female. Both surveys also included demographics questions, questions about sex and gender identification, and questions about political beliefs.Ĥ07 people on the Less Wrong Survey and 122 people on the Slate Star Codex Survey gave plausible digit ratio measurements (I rejected measurements outside the range of 0.8 – 1.3 as implausible), for a total of 529 people. I wanted to look at this more, so I included questions about digit ratio in the 2014 Less Wrong Survey and in the 2014 Slate Star Codex Survey. Maybe the weirdest paper along these lines is Madison et al’s 2014 paper showing that feminist activist women have more masculinized 2D:4D ratios than other women, which suggests something about how “neurological gender” influences the way people respond to social gender roles. But there have also been other studies that challenge some of these results, and the whole field is maddeningly inconsistent. For example, aggressiveness, penis length in men, and lesbianism in women have all been correlated with more masculine 2D:4D ratio. Past research suggests that men generally have lower 2D:4D ratios than women, and that within each sex people with various stereotypically-male characteristics have lower 2D:4D ratios than people with various stereotypically female characteristics. It seems to correlate with some kind of prenatal hormone exposure, which makes it a unique way to explore the effects of purely-biological factors on various traits without having to do hormone assays or go through an ethics board. 2D:4D ratio is the length of someone’s index finger divided by the length of their ring finger on the same hand.
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