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The most commonly studied digit ratio is that of the 2nd (index finger) and 4th (ring finger), also referred to as the 2D:4D ratio, measured on the palm side. It is proposed that the 2D:4D ratio indicates the degree to which an individual has been exposed to androgens during key stages of fetal development. A lower ratio has been associated ...
There is also evidence against this theory. For example, one possible biomarker for prenatal testosterone's effect on the brain is a low ratio of the second to fourth finger (the 2D:4D ratio), which has been found to be associated with several male-specific psychological factors. A significantly lower 2D:4D ratio than the general population has ...
The 2D;4D finger ratio, or relative lengths of the 2nd "index" and 4th "ring" fingers, has become a popular measure of prenatal androgen because of accumulated evidence suggesting the 2D;4D ratios are related to prenatal exposure to testosterone. [56]
Noting that men and women had different finger length patterns, Wilson introduced the 2D/4D digit ratio as a marker of exposure to prenatal testosterone in 1983. [19] [20] His theory that autism represented a hypermale brain [21] was influential in autism studies, [22] but has now been widely discredited. [23]
Various somatic markers (including 2D:4D finger ratios, auditory evoked potentials, fingerprint patterns and eye-blink patterns) have since been found to show variation based on sexual orientation in healthy adult individuals. [3]
A 2012 analysis failed to replicate previous findings that a lower 2D:4D digit ratio correlates with increased androgen production. The authors of the analysis then hypothesized that androgens only have a slight effect on the 2D:4D digit ratio, and that variation in that ratio could arise from a number of other genetic or non-genetic sources. [12]
6 Correlation between digit ratio and traits 2 comments Toggle Correlation between digit ratio and traits subsection 6.1 About "High digit ratio linked to Asperger's syndrome"
Leslie Van Gelder (born January 27, 1969) is an American archaeologist, writer, and educator whose primary work involves the study of Paleolithic Finger Flutings in Rouffignac Cave and Gargas Cave in Southern France.