To what extent did Neanderthals and modern humans interact?

@article{Herrera2009ToWE,
  title={To what extent did Neanderthals and modern humans interact?},
  author={Kristian J. Herrera and Jason A. Somarelli and Robert K Lowery and Rene J Herrera},
  journal={Biological Reviews},
  year={2009},
  volume={84}
}
Neanderthals represent an extinct hominid lineage that existed in Europe and Asia for nearly 400,000 years. They thrived in these regions for much of this time, but declined in numbers and went extinct around 30,000 years ago. Interestingly, their disappearance occurred subsequent to the arrival of modern humans into these areas, which has prompted some to argue that Neanderthals were displaced by better suited and more adaptable modern humans. Still others have postulated that Neanderthals… 
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