Digit Ratio: A Pointer to Fertility, Behavior, and Health
نویسندگان
چکیده
منابع مشابه
Second to fourth digit ratio and cooperative behavior.
A low second to fourth digit ratio (2D:4D) has been related to high testosterone levels and to markers of high status. In a social dilemma context status can be obtained either by acting egoistically (i.e. not contributing one's share) or by acting altruistically (i.e. contributing more than one's fair share). We therefore predicted that a low 2D:4D would be associated with high levels of egois...
متن کامل2nd to 4th digit ratio and offspring sex ratio.
There is evidence that the ratio of the length of the 2nd and 4th digit (2D:4D) is negatively related to prenatal and adult concentrations of testosterone. It has also been reported that high levels of testosterone at conception in both fathers and mothers are associated with an increased sex ratio (proportion of males at birth). It follows from these observations that low values of 2D:4D may b...
متن کاملAssociation between Second to Fourth Digit Ratio with Handwriting Quality and Speed among Elementary School Children
Background Genetic impacts on handwriting legibility and speed, especially in early childhood, are not well understood. The present study used a 2D:4D ratio as a biological marker to investigate the associations between genetic factors with quality and speed of handwriting among the elementary school children. Ma...
متن کاملOverconfidence, Incentives and Digit Ratio
This paper contributes to a better understanding of the biological underpinnings of overconfidence by analyzing performance predictions in the Cognitive Reflection Test with and without monetary incentives. In line with the existing literature we find that the participants are too optimistic about their performance on average; incentives lead to higher performance; and males score higher than f...
متن کاملThe second-to-fourth digit ratio correlates with aggressive behavior in professional soccer players
The aim of this study was to test the hypothesis that high levels of testosterone during prenatal life, testified by a low second-to-fourth digit ratio (2D:4D), as well as in adulthood affect the aggressive behavior of professional soccer players. Using 18 male professional players from a first level Italian Soccer Team we calculated: i) the 2D:4D ratio of the right hand, ii) the number of yell...
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ژورنال
عنوان ژورنال: Heredity
سال: 2002
ISSN: 0018-067X,1365-2540
DOI: 10.1038/sj.hdy.6800151