What is grammar? Why is it there? What difference, if any, does it make to the organization of meaning? This book seeks to give principled answers to these questions. Since grammar is universal in human populations, its topic is ‘universal’ grammar—or the grammatical as such. But while modern generative grammar stands in the tradition of ‘Cartesian linguistics’ as emerging in the seventeenth century, this book re-addresses the question of the grammatical in a broader historical frame, taking inspiration from Modistic and Ancient Indian philosopher-linguists to formulate a different and ‘Un-Cartesian’ programme in linguistic theory. The core claim of this programme is that the organization of the grammar is not distinct from the organization of human thought—a sapiens-specific mode of thought, that is. This mode is uniquely propositional: grammar, therefore, organizes propositional forms of reference and makes knowledge possible. An explanatory programme emerges from this, which regards the grammaticalization of the hominin brain as critical to the emergence of our mind and our speciation. A thoroughly interdisciplinary endeavour, the book seeks to systematically integrate the philosophy of language and linguistic theory. It casts a fresh look at core issues that any philosophy of (universal) grammar will need to address, such as the distinction between lexical and grammatical meaning, the significance of part of speech distinctions, the grammar of reference and deixis, the relation between language and reality, and the dimensions of cross-linguistic and biolinguistic variation.
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