From the reviews: "One of the most challenging problems in human cognition is the origin of language. ... The editors of this book have brought together two communities of researchers to record the current state of the research agenda and report some recent advances. ... This volume is a fascinating summary of the state of the art in a challenging area of research. It serves as a sobering reminder of how far we are from a consistent bottom-up explanation of the wonder of human language." (H. Van Dyke Parunak, ACM Computing Reviews, December, 2010)