What are the significant forces behind the evolution of language? Explaining how language evolved involves answering two quite distinct scientific questions (Bickerton 2003; Tomasello 2003). The first is why humans have developed a system of symbolic representation as a basis for much of their communication. The second is why this system has acquired the structural characteristics of the syntax of extant human languages. In this paper, we focus on the first question. Homo sapiens is the only species we know to have a symbolic language. If one believes that language has come into existence according to the principles of evolutionary theory, there should be some selective advantage that has promoted the development of language among humans. Recently, a popular approach has been that language arose as a result of increased social interaction , for example as a consequence of increasing group size (Dunbar 1996) or as some form of ritualization (Deacon 1997; Knight 1998b). However, despite all the merits of these proposals, they have problems explaining why humanlike symbolic language has not evolved among other apes or animals (Bickerton 2002: 209; Gärdenfors 2004: 237; Johansson, Zlatev, and Gärdenfors 2006). As a matter of fact, the social interaction among many species is highly developed. Bickerton (2002: 210) argues: “When a complex and unique development occurs in only one species, the most logical conclusion is that the selective pressure driving that development must have been unique to that species.
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