Länk - Vad förklarar evolution mest, urval eller slump?
For example, Milford Wolpoff and I (2001) showed that the rate of evolution of brain size in Late Pleistocene Neandertals was probably directionally selected. Yet, we could not reject the hypothesis of drift, under the condition that the Neandertal population was as small as 1200 effective individuals. Keep in mind that brain size evolution in humans is one of the most rapid evolutionary trends known for any large mammal! The hypothesis of drift is very hard to refute statistically with paleontological data, particularly in the absence of reliable data about demography.
Läs mer: John Hawks Anthropology Weblog : 2007 09