Biological constraints and evolution of language: a hyphotesis on the exaptation of human vocal structures

The aim of this work is to support the theory that the evolution of the human language is biologically linked to its central and peripheral structures that are not selected necessarily for linguistic purposes and that can be read in terms of "exaptation" for language. These constraints characterize language as a form of species-specific, articulated vocal production, unique for sapiens. In this situation the uniqueness of a language is not a “speciality” that comes out of the blue, but it derives from a history of morphological changes connected not only to phonation but also to hearing and in general to sapiens’ body.