The Relationship of Digit Ratio (2D:4D) and Gender-Role Orientation in Four National Samples
Abstract
Abstract. The ratio of second to fourth finger length (2D:4D ratio) is sexually dimorphic with women having higher 2D:4D ratio than men. Recent studies on the relationship between 2D:4D ratio and gender-role orientation yielded rather inconsistent results. The present study examines the moderating influence of nationality on the relationship between 2D:4D ratio and gender-role orientation, as assessed with the Bem Sex-Role Inventory, as a possible explanation for these inconsistencies. Participants were 176 female and 171 male university students from Germany, Italy, Spain, and Sweden ranging in age from 19 to 32 years. Left-hand 2D:4D ratio was significantly lower in men than in women across all nationalities. Right-hand 2D:4D ratio differed only between Swedish males and females indicating that nationality might effectively moderate the sexual dimorphism of 2D:4D ratio. In none of the examined nationalities was a reliable relationship between 2D:4D ratio and gender-role orientation obtained. Thus, the assumption of nationality-related between-population differences does not seem to account for the inconsistent results on the relationship between 2D:4D ratio and gender-role orientation.
References
(2002). A preliminary investigation of the associations between personality, cognitive ability, and digit ratio. Personality and Individual Differences, 33, 1115–1124
(2005). Finger length ratio (2D:4D) correlates with physical aggression in men but not in women. Biological Psychology, 68, 215–222
(1888). Anthropological notes on the human hand. American Anthropologist, 1, 51–76
(1977). Social learning theory. Englewood Cliffs, NJ: Prentice Hall
(1985). Relation between testosterone concentration, sex role identity, and personality among females. Journal of Personality and Social Psychology, 48, 1218–1226
(2005). Do differences in sex hormones affect handwriting style? Evidence from digit ratio and sex-role identity as determinants of the sex of handwriting. Personality and Individual Differences, 39, 459–468
(1974). The measurement of psychological androgyny. Journal of Consulting and Clinical Psychology, 42, 155–162
(1977). On the utility of alternative procedures for assessing psychological androgyny. Journal of Consulting and Clinical Psychology, 45, 196–205
(1979). Theory and measurement of androgyny: A reply to the Pedhazur-Tetenbaum and Locksley-Colten critiques. Journal of Personality and Social Psychology, 37, 1047–1054
(1981a). Bem Sex-Role Inventory: Professional manual. Palo Alto, CA: Consulting Psychological Press
(1981b). Gender schema theory: A cognitive account of sex typing. Psychological Review, 88, 354–364
(1983). Gender schema theory and its implications for child development: Raising gender-aschematic children in a gender-schematic society. Signs, 8, 598–616
(1976). Sex typing and the avoidance of cross-sex behavior. Journal of Personality and Social Psychology, 33, 48–54
(1975). Sex role adaptability: One consequence of psychological androgyny. Journal of Personality and Social Psychology, 31, 634–643
(1976). Sex typing and androgyny: Further explorations of the expressive domain. Journal of Personality and Social Psychology, 34, 1016–1023
(2004). Digit length ratios predict reactive aggression in women, but not in men. Hormones and Behavior, 46, 558–564
(1997). Early androgen effects on aggression in children and adults with congenital adrenal hyperplasia. Psychoneuroendocrinology, 22, 505–515
(2002). Differences in finger length between self-identified “butch” and “femme” lesbians. Archives of Sexual Behavior, 31, 123–128
(2002). Masculinized finger length ratios in human males and females with congenital adrenal hyperplasia. Hormones and Behavior, 42, 380–386
(2003). In utero androgen exposure and 2nd to 4th digit length ratio - Comparisons between healthy controls and females with classical congenital adrenal hyperplasia. Human Reproduction, 18, 976–979
(2006). Digit ratio (2D:4D) and the spatial representation of magnitude. Hormones and Behavior, 50, 194–199
(2003). Sexual dimorphism in the 2D:4D ratio and its relation to mental rotation performance. Evolution and Human Behavior, 24, 179–183
(2003). Sex role identity related to the ratio of second to fourth digit in women. Biological Psychology, 62, 147–156
(1986). Presentatione della versione italiana e contributo alla taratura del Bem Sex-Role Inventory. [Presentation of the Italian version and contribution to the standardization of the Bem Sex-Role Inventory] Bollettino di Psicologia Applicata, 175, 21–28
(2006). Maternal personality and reproductive ambition in women is associated with salivary testosterone levels. Biological Psychology, 71, 29–32
(1999). The origins of sex differences in human behavior: Evolved dispositions versus social roles. American Psychologist, 54, 408–423
(1875). Einige Bemerkungen über einen schwankenden Charakter in der Hand des Menschen. [Some remarks about a varying character in the hands of humans] Archiv für Anthropologie, 8, 68–75
(2005). Second to fourth digit ratio and face shape. Proceedings of the Royal Society B, 272, 1995–2001
(1994). Prototypes and dimensions of masculinity and femininity. Sex Roles, 31, 653–682
(1993). Personality characteristics and platelet MAO activity in women with congenital adrenal hyperplasia (CAH). Psychoneuroendocrinology, 18, 343–354
(2003). Sex steroids and human behavior: Prenatal androgen exposure and sex-typical play behavior in children. Annals of the New York Academy of Science, 1007, 272–282
(2004). Androgen and psychosexual development: Core gender identity, sexual orientation, and recalled childhood gender role behavior in women and men with congenital adrenal hyperplasia (CAH). The Journal of Sex Research, 41, 75–81
(1984). Culture's consequences: International differences in work-related values. Beverly Hills: Sage
(1991). Cultures and organizations: Software of the mind. London: McGraw-Hill
(2005). Second-to-fourth digit length, testosterone, and spatial ability. Intelligence, 33, 215–230
(1995). Experimental design. Procedures for the behavioral sciences (3rd ed.). Belmont, CA: Brooks/Cole
(2001). On deconstructing and reconstructing masculinity-femininity. Journal of Research in Personality, 35, 168–207
(2003). Are 2D:4D finger-length ratios related to sexual orientation? Yes for men, no for women. Journal of Personality and Social Psychology, 85, 179–188
(2006). Finger lengths, 2D:4D ratios, and their relation to gender-related personality traits and the Big Five. Biological Psychology, 71, 116–121
(2006). Population differences in finger-length ratios: Ethnicity or latitude?. Archives of Sexual Behavior, 35, 739–742
(1998). The two sexes: Growing up apart, coming together. Cambridge, MA: Belknap Press
(2006). Fetal development of the hand, digits, and digit ratio (2D:4D). Early Human Development, 82, 469–475
(2002). Digit ratio: A pointer to fertility, behavior, and health. New Brunswick, NJ: Rutgers University Press
(2000). The 2nd:4th digit ratio, sexual dimorphism, population differences, and reproductive success: Evidence for sexually antagonistic genes?. Evolution and Human Behavior, 21, 163–183
(2003). 2nd to 4th digit ratio: Ethnic differences and family size in English, Indian, and South African populations. Annuals of Human Biology, 30, 579–588
(1998). The ratio of 2nd to 4th digit length: A predictor of sperm numbers and concentrations of testosterone, luteinizing hormone, and estrogen. Human Reproduction, 13, 3000–3004
(1999). The mystery of female beauty. Nature, 399, 214–215
(2000). The 2nd:4th digit ratio and asymmetry of hand performance in Jamaican children. Laterality, 5, 121–132
(2004). Second to fourth digit ratio (2D:4D) and testosterone in men. Asian Journal of Andrology, 6, 211–215
(2005). A reanalysis of five studies on sexual orientation and the relative length of the 2nd and 4th fingers (the 2D:4D ratio). Archives of Sexual Behavior, 34, 341–356
(2002). Relative lengths of fingers and toes in human males and females. Hormones and Behavior, 42, 494–500
(2006). Sex dimorphism in digital formulae of children. American Journal of Physical Anthropology, 129, 143–150
(2005). The development of sex differences in digital formula from infancy in the Fels longitudinal study. Proceedings of the Royal Society B, 272, 1473–1479
(1966). A social learning view of sex differences in behavior. In E.E. Maccoby (Ed.), The development of sex differences (pp. 57-81). Stanford, CA: Stanford University Press
(2002). The ratio of second- and fourth-digit lengths and congenital adrenal hyperplasia due to 21-hydroxylase deficiency. Early Human Development, 70, 47–54
(1971). The assessment and analysis of handedness: The Edinburgh Inventory. Neuropsychologia, 9, 97–113
(1999). Exploring the meaning of gender: Evaluating and revising the Bem Sex-Role Inventory (BSRI) for a Swedish research context (BSRI-SE). Jönköping: School of Education & Communication, Jönköping University
(2002). Finger length and distal finger extent patterns in humans. American Journal of Physical Anthropology, 117, 209–217
(2002). Sex-specific finger-length patterns linked to behavioral variables: Consistency across various human populations. Perceptual and Motor Skills, 94, 171–181
(2004). Sex hormones and finger length - What does 2D:4D indicate?. Evolution and Human Behavior, 25, 182–199
(2003). Sexual orientation and the 2nd to 4th finger length ratio: Evidence for organizing effects of sex hormones or developmental instability?. Psychoneuroendocrinology, 28, 288–303
(in press). Sexual dimorphism in second-to-fourth digit ratio and its relation to gender-role orientation in males and females. Personality and Individual Differences,
(2006). Examination marks of male university students positively correlate with finger length ratios (2D:4D). Biological Psychology, 71, 175–182
(1988). Die Erfassung von Geschlechtsrollen - Ergebnisse zur deutschen Neukonstruktion des Bem Sex-Role-Inventory. [Assessment of sex roles - results of a German version of the Bem Sex-Role Inventory] Diagnostica, 34, 256–270
(1990). Las escalas de masculinidad y feminidad: Presupuestos subyacentes al modelo clásico y actual. Segunda parte: el modelo actual. [The scales on masculinity and femininity: Underlying assumptions of the classical and current models: II. The current model] Evaluación Psicológica, 6, 327–367
(1980). Masculine instrumentality and feminine expressiveness: Their relationships with sex role attitudes and behaviors. Psychology of Women Quarterly, 5, 147–163
(1998). Results of screening 1. million Texas newborns for 21-hydroxylase-deficient congenital adrenal hyperplasia. Pediatrics, 101, 583–590
(2000). Biological limits of gender construction. American Sociological Review, 65, 443–457
(1988). Sex hormone effects on personality at puberty. Journal of Personality and Social Psychology, 54, 291–295
(2006). Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins. Hormones and Behavior, 49, 315–319
(2000). Finger-length ratios and sexual orientation. Nature, 404, 455–456
(1983). Finger-length as an index of assertiveness in women. Personality and Individual Differences, 4, 111–112
(2002). A cross-cultural analysis of the behavior of women and men: Implications for the origins of sex differences. Psychological Bulletin, 128, 699–727