OOA evolves into two waves.... and probably many more to come.
The scientists tested different hypothetical dispersal scenarios, taking into account the geography of potential migration routes, genetic data and cranial comparisons. They found that the first wave of migration out of Africa started earlier than previously thought, taking place as early as the late Middle Pleistocene -- with a second dispersal to northern Eurasia following about 50,000 years ago.
I still don't like the word "migration" in this sense. It implies an intent.