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This chapter begins with a discussion of the gestural theories on the origin of language. It argues that the natural sign languages used by modern deaf people are fully modern languages in every meaningful sense. Aspects of the structures of these languages and the historical processes through which these languages came into existence can shed light on the way human language in general most probably evolved. An overview of the succeeding chapters is presented.

This chapter reviews what has been learned about animal thinking from the study of animal communication and considers what we might hope to learn in the future. It begins with a discussion on the importance of informational versus non-informational interpretations of animal communication and then considers what inferences can be drawn about the cognitive requirements of communication from the communicative abilities of simple organisms. It discusses the importance of context to the meaning of animal signals and the possibility of asymmetries in the neural processes underlying production versus reception. Current theories on the evolution of human language are reviewed and how the study of animal communication informs these theories.

Language is probably the most complex form of universal communication. A finite set of words enables us to express a mere infinite number of thoughts and ideas, which we set together by obeying grammatical rules and compositional, semantic knowledge. This chapter addresses how human language abilities have evolved and how they develop. A short introduction to linguistics covers the most important conceptualized aspects, including language production, phonology, syntax, semantics, and pragmatics. The brain considers these linguistic aspects seemingly in parallel when producing and comprehending sentences. The brain develops some dedicated language modules, which strongly interact with other modules. Evolution appears to have recruited prelinguistic developmental neural structures and modified them into maximally language-suitable structures. Moreover, evolution has most likely evolved language to further facilitate social cooperation and coordination, including the further development of theories of the minds of others. Language develops in a human child building on prelinguistic concepts, which are based on motor control-oriented structures detailed in the previous chapter. A final look at actual linguistic communication emphasizes that an imaginary common ground and individual private grounds unfold between speaker and listener, characterizing what is actually commonly and privately communicated and understood.