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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 ...
The Behaviour and Personality Assessment in Dogs (Beteende och personlighetsbeskrivning hund), commonly abbreviated as BPH, is a behavioural assessment developed by the Swedish Kennel Club (SKK) in May 2012 [1] [2] that aims to accurately describe the personality of a dog irrespective of whether it is a working, pet or breeding dog.
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 ...
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]
One theory is the second to fourth finger ratio (2D:4D) theory. Some studies have discovered that heterosexual women had higher 2D:4D ratios than did lesbian women but the difference was not found between heterosexual and gay men. [28]
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Baron-Cohen says that tests of the E–S model show that twice as many females than males are Type E and twice as many males than females are Type S. 65% of people with autism spectrum conditions are Extreme Type S. [6] The concept of the Extreme Type E brain has been proposed; however, little research has been conducted on this brain profile. [31]
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.