• The Gestural Theory of and the Vocal Theory of Language Origins Are Not Incompatible with One Another.- The Gestural Origins of Language.- World-View of Protolanguage Speakers as Inferred from Semantics of Sound Symbolic Words: A Case of Japanese Mimetics.- Japanese Mothers’ Use of Specialized Vocabulary in Infant-Directed Speech: Infant-Directed Vocabulary in Japanese.- Short-Term Acoustic Modifications During Dynamic Vocal Interactions in Nonhuman Primates— Implications for Origins of Motherese.- Vocal Learning in Nonhuman Primates: Importance of Vocal Contexts.- The Ontogeny and Phylogeny of Bimodal Primate Vocal Communication.- Understanding the Dynamics of Primate Vocalization and Its Implications for the Evolution of Human Speech.- Implication of the Human Musical Faculty for Evolution of Language.

From the reviews: "The book consists of an introductory chapter followed by eight others, each of which addresses one of the two aspects of language development. The book ... provides a helpful, succinct overview of various aspects of language evolution and offers interesting new hypotheses. ... Masataka was successful in bringing together researchers using very different approaches for an empirically focused and comparative approach to language and its origins." (Tobias Riede, Primates, Vol. 50, 2009)