Finger lengths, 2D:4D ratios, and their relation to gender-related personality traits and the Big Five

Biol Psychol. 2006 Jan;71(1):116-21. doi: 10.1016/j.biopsycho.2005.02.004. Epub 2005 Apr 26.

Abstract

Finger lengths and the ratio of index finger to ring finger length (2D:4D) may be markers of gonadal hormone exposure. The current study investigated possible associations between absolute finger lengths, 2D:4D ratios, and gender-related personality traits in over 2000 participants. Regression analyses showed no associations between men's 2D:4D ratios and gender-related personality traits and weak associations between women's 2D:4D ratios and gender-related occupational preferences. Men's absolute finger lengths were weakly associated with self-ascribed masculinity, and women's absolute finger lengths were weakly associated with masculine occupational preferences. Big Five personality traits were assessed in a subsample of over 1000 participants. Analyses showed a weak positive association between 2D:4D and extraversion and a weak negative association between 2D:4D and openness to experience. Absolute finger lengths showed a weak negative association with agreeableness and a tendency to be associated with women's but not men's openness. Overall, associations between finger-length measures and personality were weak and inconsistent.

MeSH terms

  • Adult
  • Assertiveness
  • Female
  • Fingers / anatomy & histology*
  • Gonads / physiology
  • Humans
  • Male
  • Personality Inventory
  • Personality*
  • Sex Factors
  • Sexual Behavior
  • Surveys and Questionnaires