Digit ratio : a pointer to fertility, behavior, and health
Author(s)
Bibliographic Information
Digit ratio : a pointer to fertility, behavior, and health
（The Rutgers series in human evolution）
Rutgers University Press, c2002
- : cloth
- : pbk.
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Note
Includes bibliographical references (p. 147-164) and index
Contents of Works
- Machine generated contents note: CHAPTER 1: Sex and Population Differences 1
- CHAPTER 2: Associations with Testosterone and Estrogen 24
- CHAPTER 3: Assertiveness, Status, Aggression, Attractiveness,
- and the Wearing of Rings 41
- CHAPTER 4: Reproductive Success and Sexually Antagonistic
- Genes 53
- CHAPTER 5: Hand Preference, Verbal Fluency, Autism,
- and Depression 62
- CHAPTER 6: Birth Weight, Heart Attack, Breast Cancer, and
- Sex-Dependent Diseases 76
- CHAPTER 7: Male and Female Homosexuality 100
- CHAPTER 8: Music, Musicians, and Mate Choice 115
- CHAPTER 9: Sporting Ability, Running Speed, Spatial Perception,
- Football Players, and Male Competition 126
- CHAPTER 10: 2nd to 4th Digit Ratio and Future Research 141
Description and Table of Contents
- Volume
-
: cloth ISBN 9780813530291
Description
Could the length of your fingers predict a predisposition to breast cancer? Or musical genius? Or homosexuality? The author posits that relative lengths of the second and fourth digits in humans (2D:4D ratio) provides a window into fertility- and sex-related traits. It has been known for more than a century that men and women tend to differ in the relative lengths of their index and ring fingers, which upon casual observation seem fairly symmetrical. Men on average have fourth digits longer than their second digits, while women typically have the opposite. Digit ratios are unique in that they are fixed before birth, while other sexually dimorphic variables are fixed after puberty, and the same genes that control finger length also control the development of the sex organs. The 2D:4D ratio is the only prenatal sexually dimorphic trait that measurably explains conditions linking testosterone, oestrogen and human development, the author argues. The study of the ratio broadens our view of human ability, talent, behaviour, disposition, health and fertility.
In this book, Manning presents evidence for how 2D:4D correlates with genetic traits ranging from sperm counts, the likelihood of having male versus female offspring, musical genius, homosexuality and sporting prowess, to autism, depression, heart attacks, or breast cancer, traits that are all linked to sex hormones.
Table of Contents
Sex and Population Differences * Associations with Testosterone and Estrogen * Assertiveness, Aggression, Attractiveness, and the Wearing of Rings * Reproductive Success and Sexually Antagonistic Genes * Hand Preference, Verbal Fluency, Autism, and Depression * Birth Weight, Heart Attack, Breast Cancer, and Sex-Dependent Diseases * Male and Female Homosexuality * Music, Musicians, and Mare Choice * Sporting Ability, Running Speed, Spatial Perception, Football Players, and Male Competition * 2nd to 4th Digit Ratio and Future Research
- Volume
-
: pbk. ISBN 9780813530307
Description
Could the length of your fingers indicate a predisposition to breast cancer? Or musical genius? Or homosexuality? In Digit Ratio, John T. Manning posits that relative lengths of the second and fourth digits in humans (2D:4D ratio) does provide such a window into hormone- and sex-related traits.It has been known for more than a century that men and women tend to differ in the relative lengths of their index (2D) and ring (4D) fingers, which upon casual observation seem fairly symmetrical. Men on average have fourth digits longer than their second digits, while women typically have the opposite. Digit ratios are unique in that they are fixed before birth, while other sexually dimorphic variables are fixed after puberty, and the same genes that control for finger length also control the development of the sex organs. The 2D:4D ratio is the only prenatal sexually dimorphic trait that measurably explains conditions linking testosterone, estrogen, and human development; the study of the ratio broadens our view of human ability, talent, behavior, disposition, health, and fertility. In this book, Manning presents evidence for how 2D:4D correlates with traits ranging from sperm counts, family size, musical genius, and sporting prowess, to autism, depression, homosexuality, heart attacks, and breast cancer, traits that are all linked with early exposure to sex hormones.
Table of Contents
Sex and Population Differences * Associations with Testosterone and Estrogen * Assertiveness, Aggression, Attractiveness, and the Wearing of Rings * Reproductive Success and Sexually Antagonistic Genes * Hand Preference, Verbal Fluency, Autism, and Depression * Birth Weight, Heart Attack, Breast Cancer, and Sex-Dependent Diseases * Male and Female Homosexuality * Music, Musicians, and Mare Choice * Sporting Ability, Running Speed, Spatial Perception, Football Players, and Male Competition * 2nd to 4th Digit Ratio and Future Research
by "Nielsen BookData"