Latitudinal Gradient in 2D:4D
Letter to the Editor
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The potential dependence of second-to-fourth digit ratio (2D:4D) on latitude has been discussed in recent papers in this journal (Hurd & van Anders, 2007; Loehlin, McFadden, Medland, & Martin, 2006, 2007). Such an association was first suggested by Manning ( 2002), who proposed that 2D:4D was highest at intermediate latitudes and lowest at the equator and at high latitudes. In their Fig. 1, Hurd and van Anders ( 2007) plotted the combined data of Loehlin et al. ( 2006) and Manning ( 2002). This figure shows a clear positive latitudinal trend in 2D:4D, except that data from Finland seem an outlier from this otherwise rather linear trend. Thus, the suggestion of low 2D:4D at high latitudes depends critically on these data from Finns.
KeywordsCervical Cancer High Latitude Northern Latitude Sami Latitudinal Variation
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