ancient structure

Yang MA, Malaspinas A-S, Durand EY & Slatkin M 2012 Ancient structure in Africa unlikely to explain Neanderthal and non-African genetic similarity. Mol Biol Evol 29:2987-2995.

• the ancient structure model results in more variation in gene tree depth than the recent admixture model
• greater variance in tree depth would alter the frequency spectrum but not the D statistic
• the sfs appropriately conditioned can distinguish between recent admixture and ancient structure because it is particularly sensitive to episodes of recent admixture