How Did Human Hearing Evolve?

The way we hear is essential to our human experience, but how did hearing evolve? Did early hominids hear like we do?

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Ancient Human Ancestors Heard Differently
http://www.scientificamerican.com/podcast/episode/ancient-human-ancestors-heard-differently/

“Now a study finds that early human species may have had sharper hearing in certain frequencies than we enjoy.”

Hearing Ability of Early Humans Revealed in New Study
http://www.newhistorian.com/hearing-ability-of-early-humans-revealed-in-new-study/4926/

“A new research study has revealed that human ancestors as they existed around two million years in the past had an ability to hear that has much in common with the modern chimpanzee – but with several indications that evolution was already having an effect."
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