"Biological anthropologist Marc Hauser seeks to isolate the aspects of human thought that account for what he terms "humaniqueness," the difference between animal and human thought"

."Across the board, Hauser says, there are signs that animal evolution passed along some capabilities “and then something dramatic happened, a huge leap that enabled humans to break away. Once symbolic representation happened, if the combinatorial capacity was there, things just took off. Precisely how and when this happened, we may never know.”