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Is language unique to humans? - my latest at BBC Future
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Great topic! I do find it fascinating that some animals can at the very least share in verbal behavior with humans. I do have a comment about what Lashley said that links language and action. Are they not the same thing? Is language not the behavior of talking, writing, etc? Instead I think it would be simpler to say, "Human actions are sequentially ordered. Verbal behavior follows this as well." It can be observed that humans have significantly more possible behaviors and sequences of those behaviors than do animals. Animals do not have the genetic background to appropriately respond to the complex behaviors of humans, although it would appear that some animals have enough genetic background and individual history to learn how to respond appropriately on basic levels. How humans came to have such a great variety of behaviors is a topic I find extremely interesting as well. 
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