A preliminary investigation of the associations between personality, cognitive ability and digit ratio

By Elizabeth J. Austin, J. Manning, Katherine McInroy, E. Mathews. 2002

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Digit ratios (2D:4D) as predictors of risky decision making for both sexes (2011, background): “Conversely, a number of traits more commonly seen in women are positively correlated with 2D:4D including high verbal fluency (Manning 2002), emotional problems (Williams, Greenhalgh and Manning 2003) and neuroticism (Austin et al. 2002).”
Second to fourth digit ratio and the 'big five' personality factors (2004, background): “This result is in accord with previous studies where females have been shown to score higher on neuroticism than males, and that 2D:4D was positively related to neuroticism in males and females combined and most strongly related in females (Austin et al., 2002).”