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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 ...
Facts of 2D:4D ratio [ edit ] Finger ratio has been examined in relation to a number of physical traits that show sex differences and evidence suggests it is influenced by the prenatal environment, although there is no direct evidence for the latter. [ 16 ]
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]
Their work, building on the internal analysis concepts established by Alexander Marshack, was the first to be able to establish unique identities of cave artists through the study of individual hands and the application of 2D:4D finger studies.
There is research evidence that the digit ratio of the length of the 2nd and 4th digits (index finger and ring finger) is somewhat negatively related to prenatal testosterone and positively to estrogen. Studies measuring the fingers found a statistically significant skew in the 2D:4D ratio (long ring finger) towards homosexuality with an even ...
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"
The peak is "well-sampled", so that less than 10% of the area or volume under the peak (area if a 1D Gaussian, volume if a 2D Gaussian) lies outside the measurement region. The width of the peak is much larger than the distance between sample locations (i.e. the detector pixels must be at least 5 times smaller than the Gaussian FWHM).