The common factor to twentieth-century linguistic theory is the hypothesis, differently interpreted, that the communicative dynamics of language requires the resolution of a centre into a periphery and vice versa. This line of explication coincides with the most recent neuro-psychological discoveries, related to aphasia. Particularly, with the theory of simultaneous Convergence Zones (ZC), which allow the linguistic understanding. A rapid survey of the modern debate on language confirms the constant theoretical trend, setting this natural feature among the intellectual structures implied by language. To discover the working principles shared by mind and language is the future task of the theoretical linguistics