Tone and genes: New cross-linguistic data and methods support the weak negative effect of the "derived" allele of ASPM on tone, but not of Microcephalin.

2007: The main results The Pearson correlations between tone and ASPM -D ( r = −0.53, p = 9.63 ⋅ 10 −5 ) and MCPH1 -D ( r = −0.54, p = 7.22 ⋅ 10 −5 ) are not only highly significant, but also stronger than most (> 98.5%) of all the possible 25,558 such correlations.

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